Neptune

Name: Neptune, English Word Data
Creator: Wiktionary
License: https://creativecommons.org/licenses/by-sa/4.0/

/ˈnɛptjuːn/

//ˈnɛptjuːn// name

By PlainSpell Editorial Team · According to Wiktionary data (CC BY-SA) · analyzed May 6, 2026

The verdict

“Neptune” is a moderately-common English word, ranked #18,140 in English word frequency and used as a proper noun.

#18,140
frequency rank, English: 7
letters: 10
tracked misspellings

According to Wiktionary data (CC BY-SA, analyzed May 6, 2026) - The eighth planet in our solar system, represented in astronomy and astrology by ♆.

Key facts for Neptune
Property	Value
Headword	Neptune
Language	English
Part of speech	Proper noun
IPA	/ˈnɛptjuːn/
Letters	7
Frequency rank	#18,140
Misspellings tracked	10
Confusable pairs	0
Source	Wiktionary (kaikki.org)

Where “Neptune” sits in English frequency

Every-word frequency runs from the handful of words we use constantly (left) to the long tail used once in a blue moon (right). Neptune lands here:

#18,140

#1#100#1K#10K#100K

← used constantlyrarely used →

Scale is logarithmic (each tick is 10× rarer). Source: FrequencyWords open word-frequency list.

Spelling & Dictionary Insight

The English entry for Neptune is 7 letters long, classified as a proper noun, and transcribed in the International Phonetic Alphabet as /ˈnɛptjuːn/. Corpus data places it at rank #18,140 in overall English word frequency, marking it as uncommon enough that many writers pause before typing it. Wiktionary records 6 distinct senses for this headword, so context determines which meaning a reader should apply.

Our generated misspelling index lists 10 likely wrong-spelling variants for Neptune, with forms such as "enptune", "nepptune", and "neptnue". 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. Our dataset records no confusable match here, since no other headword is close enough in sound or shape to pair with it.

Etymologically, the entry records: From Middle English Neptune, Neptunus, a borrowing from Latin Neptūnus, possibly from Proto-Indo-European *nébʰ-tu-s (“damp, cloudy”) (source of Ancient Greek νέφος (néphos), Sanskrit नभस् (nábhas), etc.), with the sense of "wet, moist." Puhvel, however, co… The correct English form is Neptune, spelled N-E-P-T-U-N-E.

Definition

1
The eighth planet in our solar system, represented in astronomy and astrology by ♆.
2
The god of the ocean and of earthquakes, equivalent to Poseidon in Greek mythology.
3
A township in Monmouth County, New Jersey, United States.
4
An unincorporated community in Mercer County, Ohio.
5
An unincorporated community in Jackson County, West Virginia.
6
An unincorporated community in Ithaca, Richland County, Wisconsin.

Etymology

From Middle English Neptune, Neptunus, a borrowing from Latin Neptūnus, possibly from Proto-Indo-European *nébʰ-tu-s (“damp, cloudy”) (source of Ancient Greek νέφος (néphos), Sanskrit नभस् (nábhas), etc.), with the sense of "wet, moist." Puhvel, however, connects it with Proto-Italic *nepōts from Proto-Indo-European *népōts by analogy to Portūnus, cognate with Vedic Apām Napāt and Avestan Apąm Napāt, Child (cf: neve, nephew) of the Water as part of an Indo-European 'Fire in the Water' myth.

Synonyms

♆⯉

This word in other languages

Neptuno(Español)Neptune(Français)Neptun(Deutsch)

Common misspellings

Also misspelled as: enptune,nepptune,neptnue,nepttune,neptuen,neptunne,neputne,netpune,nneptune,npetune

Misspelling Pattern Breakdown

How far each generated variant is from the correct spelling of Neptune - counted as single-character edits (an insertion, a deletion, or a substituted letter). The larger the bar, the easier the typo is to spot; one-edit slips are the ones that sneak past readers.

Edit distance from "Neptune"

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 "Neptune"?

"Neptune" is spelled N-E-P-T-U-N-E. The IPA pronunciation is /ˈnɛptjuːn/.

What does "Neptune" mean?

As a proper noun, "Neptune" means: The eighth planet in our solar system, represented in astronomy and astrology by ♆.

What are common misspellings of "Neptune"?

Common misspellings include "enptune", "nepptune", "neptnue", "nepttune", "neptuen". The correct spelling is "Neptune".

How do you pronounce "Neptune"?

The IPA (International Phonetic Alphabet) transcription for "Neptune" is /ˈnɛptjuːn/. 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 "Neptune"?

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.

Using “Neptune”

The practical upshot for anyone who landed here from a spell-check.

The one correct English spelling is N-E-P-T-U-N-E - every other letter order is a misspelling in standard orthography.
Say it as /ˈnɛptjuːn/ (IPA); tap the speaker on the pronunciation badge to hear it where audio exists.
Browse more English words and confusable pairs in the same reference. English words

Data Source

Wiktionary (via kaikki.org), licensed under CC BY-SA & GFDL. Word ordering uses an open word-frequency list; misspelling variants are generated by edit-distance from the correct headword.