insulator

/ˈɪn.s(j)ə.leɪ.tə(ɹ)/

//ˈɪn.s(j)ə.leɪ.tə(ɹ)// noun

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

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

The verdict

“insulator” has 13 generated spelling variants in the English index at frequency #39,864. The variants make it a useful spelling check.

#39,864
frequency rank, English
2,140
“I” headwords
13
tracked misspellings
5
confusable pairs

According to Wiktionary data (CC BY-SA, analyzed September 3, 2026) - A substance that does not transmit heat (thermal insulator), sound (acoustic insulator) or electricity (electrical insulator).

Corpus desk

Index EN-insulator · insulator · English

insulator · rank #39,864 · 13 variants · 5 confusables

  • FREQ-MID #39,864
  • LEN-LONG 9 letters
  • VOW-4 4 vowels
  • CONFUS-MID 5 pairs
  • VAR-HIGH 13 variants
  • BOOK-MID 2,140
  • PHOTO-FINISH invert

Nearest frequency peer: invert (+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 “insulator”

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

corpus weight

What this shows “insulator” 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).

insulator vs insular
78% similar
insulator vs insulate
78% similar
insulator vs insulated
78% similar

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

Key facts for insulator
PropertyValue
Headwordinsulator
LanguageEnglish
Part of speechNoun
IPA/ˈɪn.s(j)ə.leɪ.tə(ɹ)/
Letters9
Frequency rank#39,864
Misspellings tracked13
Confusable pairs5
SourceWiktionary (kaikki.org)

Frequency seat of misspelling magnet “insulator”

This scale runs from the tiny cluster of words that carry ordinary speech (left) to the long tail of words almost nobody reaches for (right).insulatorlands here:

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

Ticks step logarithmically, so each one marks a roughly tenfold drop in how often the word turns up. Same rarity band neighbours include “invert” (#39,865), “insolent” (#39,862), “invertebrate” (#39,866). Among 2,140 “I” headwords, “insulator” is #39,864. Source: FrequencyWords open word-frequency list.

A misspelling magnet

The generator records 13 spelling variants around insulator (IPA /ˈɪn.s(j)ə.leɪ.tə(ɹ)/), anoun. Corpus frequency is #39,864 among 2,140 “I” headwords. Wiktionary lists 3 senses, so context still picks the gloss.

Our generated misspelling index lists 13 likely wrong-spelling variants for insulator, with forms such as "innsulator", "insluator", and "inssulator". Each of these forms differs from the correct spelling by one small edit: a doubled letter, a dropped silent letter, or a substituted vowel. It also participates in 5 confusable-pair relationships, "insular", "insulate", "insulated", and more, a pairing that trips writers up because the two words share enough sound or shape to blur together.

Etymologically, the entry records: From insulate + -or. The correct English form is insulator, spelled I-N-S-U-L-A-T-O-R.

Definition

  1. 1
    A substance that does not transmit heat (thermal insulator), sound (acoustic insulator) or electricity (electrical insulator).
  2. 2
    A non-conductive structure, coating or device that does not transmit sound, heat or electricity (see image)
  3. 3
    A person who installs insulation.

Recorded use

Wiktionary examples

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

  1. To isolate electrical wires from the pylons supporting them, one often uses glass insulators.
  2. Alan Vasen worked as an insulator at this site from September 1968 through mid-April 1969. Mr. Vasen installed thousands of lineal feet of asbestos pipe covering and thousands of square feet of asbestos block insulation throughout the operating units of the Benicia refinery.

Etymology

From insulate + -or.

Synonyms

insulantisolation

Antonyms

conductor

This word in other languages

aislante(Español)isolateur(Français)Isolator(Deutsch)isolante(Português)

Common misspellings

Also misspelled as:

  • innsulator
  • insluator
  • inssulator
  • insualtor
  • insulaotr
  • insulatorr
  • insulatro
  • insulattor
  • insullator
  • insultaor
  • inuslator
  • isnulator
  • nisulator

Misspelling Pattern Breakdown

How far each generated variant is from the correct spelling of insulator - 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.

innsulator1insluator2inssulator1insualtor2insulaotr2insulatorr1insulatro2insulattor1
Edit distance from "insulator"

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 "insulator"?
"insulator" is spelled I-N-S-U-L-A-T-O-R. The IPA pronunciation is /ˈɪn.s(j)ə.leɪ.tə(ɹ)/.
What does "insulator" mean?
As a noun, "insulator" means: A substance that does not transmit heat (thermal insulator), sound (acoustic insulator) or electricity (electrical insulator).
What words are commonly confused with "insulator"?
"insulator" is commonly confused with "insular", "insulate", "insulated". These words look or sound similar but have different meanings. PlainSpell provides detailed comparisons for each pair.
How do you pronounce "insulator"?
The IPA (International Phonetic Alphabet) transcription for "insulator" is /ˈɪn.s(j)ə.leɪ.tə(ɹ)/. 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 "insulator"?
From insulate + -or. 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 "insulator", not the corpus desk frequency band.

Same letter count

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

Keynesian#39,882guesswork#39,835Gregorian#39,833formulaic#39,820

Similar misspelling depth

Headwords with a similar count of attested misspellings (13 here; floor ≥5).

Morecambe13 variantsmotorcade13 variantsdrunkard13 variantspiggyback13 variants

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

Source: FrequencyWords open word-frequency list