astronomy

/əˈstɹɑn.ə.mi/

//əˈstɹɑn.ə.mi// noun

By · According to Wiktionary data (CC BY-SA) ·

"astronomy" is a 9-letter English headword indexed on PlainSpell.

The verdict

“astronomy” has 14 generated spelling variants in the English index at frequency #12,367. The variants make it a useful spelling check.

#12,367
frequency rank, English
3,931
“A” headwords
14
tracked misspellings
3
confusable pairs

According to Wiktionary data (CC BY-SA, analyzed September 3, 2026) - The study of the physical universe beyond the Earth's atmosphere, including the process of mapping locations and properties of the matter and radiation in the universe.

Corpus desk

Index EN-astronomy · astronomy · English

astronomy · rank #12,367 · 14 variants · 3 confusables

  • FREQ-MID #12,367
  • LEN-LONG 9 letters
  • VOW-4 4 vowels
  • CONFUS-LOW 3 pairs
  • VAR-HIGH 14 variants
  • BOOK-MID 3,931
  • PHOTO-FINISH assertion

Nearest frequency peer: assertion (-1 rank slots)

Read with this headword: Spelling guide for this pattern

Desk codes from Wiktionary headword shape, FrequencyWords rank tier, confusable-pair count, generated misspelling depth, letter-cohort book size, and photo-finish peer. Not a difficulty grade.

Rank peers near misspelling magnet “astronomy”

Same rarity band: useful when a typo lands on a peer headword

corpus weight

What this shows “astronomy” sits among these FrequencyWords peers; misspelling depth is tracked separately in the edit-distance chart.

Source FrequencyWords open word-frequency list As of September 3, 2026

Visual similarity to commonly confused words

How many letter changes separate each confused pair (Levenshtein distance, normalized).

astronomy vs autonomy
78% similar
astronomy vs astrology
78% similar
astronomy vs astronomer
80% similar

Source: PlainSpell confusable corpus (Wiktionary, CC BY-SA).

Key facts for astronomy
PropertyValue
Headwordastronomy
LanguageEnglish
Part of speechNoun
IPA/əˈstɹɑn.ə.mi/
Letters9
Frequency rank#12,367
Misspellings tracked14
Confusable pairs3
SourceWiktionary (kaikki.org)

Frequency seat of misspelling magnet “astronomy”

Word frequency stretches from the small set of words we reach for constantly (left) out to the long tail barely used once in a while (right).astronomylands here:

#1#100#1K#10K#100K
← used constantlyrarely used →

Scale is logarithmic (each tick is 10× rarer). Same rarity band neighbours include “assertion” (#12,366), “atop” (#12,368), “Assad” (#12,365). Among 3,931 “A” headwords, “astronomy” is #12,367. Source: FrequencyWords open word-frequency list.

A misspelling magnet

The generator records 14 spelling variants around astronomy (IPA /əˈstɹɑn.ə.mi/), anoun. Corpus frequency is #12,367 among 3,931 “A” headwords. Wiktionary lists 2 senses, so context still picks the gloss.

Our generated misspelling index lists 14 likely wrong-spelling variants for astronomy, with forms such as "asrtonomy", "asstronomy", and "astornomy". Every one of these variants traces to a single-character edit -- an added or dropped letter, a swapped consonant, or a vowel swap -- the kind of slip a spell-checker is built to catch. It also participates in 3 confusable-pair relationships, "autonomy", "astrology", "astronomer", since the words sound or look close enough that writers reach for the wrong one mid-sentence.

Etymologically, the entry records: From Middle English astronomie, astronemy, from Old French astronomie, equivalent to astro- + -nomy. Displaced native Old English tungolcræft. The correct English form is astronomy, spelled A-S-T-R-O-N-O-M-Y.

Definition

  1. 1
    The study of the physical universe beyond the Earth's atmosphere, including the process of mapping locations and properties of the matter and radiation in the universe.
  2. 2
    Astrology.

Recorded use

Wiktionary examples

These source excerpts show how astronomy appears in context. They illustrate usage; the definition above remains the entry’s reference meaning.

  1. The fact is, dark energy is the biggest mystery in science. It has driven a huge amount of research in the past decade, and was a key driver in last year’s “New Worlds, New Horizons” report from the National Academies of Science, which prioritized future astronomy and astrophysics projects.
  2. Not from the stars do I my judgment pluck; And yet methinks I have astronomy […]

Etymology

From Middle English astronomie, astronemy, from Old French astronomie, equivalent to astro- + -nomy. Displaced native Old English tungolcræft.

Synonyms

astronomy

This word in other languages

astronomía(Español)astronomie(Français)Astronomie(Deutsch)astronomia(Português)

Common misspellings

Also misspelled as:

  • asrtonomy
  • asstronomy
  • astornomy
  • astrnoomy
  • astronmoy
  • astronnomy
  • astronommy
  • astronomyy
  • astronoym
  • astroonmy
  • astrronomy
  • asttronomy
  • atsronomy
  • satronomy

Misspelling Pattern Breakdown

How far each generated variant is from the correct spelling of astronomy - measured in single-character edits (insert, delete, or substitute a letter). Larger bars are easier to catch; one-edit slips are the sneakiest.

asrtonomy2asstronomy1astornomy2astrnoomy2astronmoy2astronnomy1astronommy1astronomyy1
Edit distance from "astronomy"

Definitions, pronunciation, and etymology for this entry are drawn from Wiktionary via the kaikki.org structured extract (CC BY-SA); frequency ordering uses the FrequencyWords open word-frequency list (2018 English corpus, MIT). See the methodology for how each field is sourced and updated.

Frequently Asked Questions

How do you spell "astronomy"?
"astronomy" is spelled A-S-T-R-O-N-O-M-Y. The IPA pronunciation is /əˈstɹɑn.ə.mi/.
What does "astronomy" mean?
As a noun, "astronomy" means: The study of the physical universe beyond the Earth's atmosphere, including the process of mapping locations and properties of the matter and radiation in the universe.
What words are commonly confused with "astronomy"?
"astronomy" is commonly confused with "autonomy", "astrology", "astronomer". These words look or sound similar but have different meanings. PlainSpell provides detailed comparisons for each pair.
How do you pronounce "astronomy"?
The IPA (International Phonetic Alphabet) transcription for "astronomy" is /əˈstɹɑn.ə.mi/. Click the speaker icon on the pronunciation badge above to hear it spoken aloud where audio is available.
What is the origin of the word "astronomy"?
From Middle English astronomie, astronemy, from Old French astronomie, equivalent to astro- + -nomy. Displaced native Old English tungolcræft. See the full etymology section above for more details.
Is PlainSpell free to use?
Yes, PlainSpell is a completely free word reference. You can look up definitions, pronunciations, confusable pairs, homophones, and spelling corrections across 5 languages without any sign-up or subscription.

Similar English words by spelling shape

Same letter count and similar misspelling depth for "astronomy", not the corpus desk frequency band.

Same letter count

Frequency-ranked English headwords with 9 letters (nearest by frequency rank).

assertion#12,366allergies#12,360bothering#12,378accessory#12,354

Similar misspelling depth

Headwords with a similar count of attested misspellings (14 here; floor ≥5).

affiliation14 variantsconsulted14 variantssupremacy14 variantssubstrate14 variants

Source: Wiktionary (via kaikki.org) Structured Wiktionary extract

Source: FrequencyWords open word-frequency list