ies vs ion, What's the Difference?

Which to use

“ies” and “ion” are a confusable English pair: similar on the page, but distinct in meaning, check the gloss before you choose.

#45,988
“ies” frequency rank: #5,604
“ion” frequency rank: 51592
confusion score

Side-by-Side Comparison

Feature	ies	ion
Definition	plural of i, the name of the letter I.	An atom or group of atoms bearing an electrical charge, such as the sodium and chlorine atoms in a salt solution.

Where the spellings diverge

Shared letters are muted; the letters that actually set ies and ion apart are highlighted. They share 1 letter in sequence, which is exactly why the eye skips the difference.

3 ch

ies

3 ch

ion

Spelling & Dictionary Insight

ies and ion are indexed as a confusable English pair. We have no recorded pronunciation or part of speech for both members, so the spelling overlap is what we can show you: they share most of their letters but differ in 2 positions. Our composite confusion score for this pair is 51592, derived from the frequency rank of both members and their visual similarity.

ies is recorded at frequency rank #45,988, classified as anoun. ion is at rank #5,604, tagged as anoun, pronounced /ˈaɪən/.

Glosses for this pair are partially populated in our dataset, but the full side-by-side definitions above should still guide you to the right choice.

With a confusion score of 51592, this pair ranks #164,190 of 530,003 scored English confusable pairs - roughly mid-pack for confusability.

Orthographic DNA of ies vs ion

Shared letters: i. Private to "ies": es. Private to "ion": no.

"ies" · 3 letters · shape VVC · "ion" · 3 letters · shape VVC

Frequency comparison

ies#45,988

ion#5,604

Source: FrequencyWords open word-frequency list

Frequently Asked Questions

Can "ies" and "ion" be used interchangeably?

No. They share most of their letters but differ in 2 positions, but the dictionary glosses above give them different meanings, so swapping one for the other changes what the sentence says.

Which is more common, "ies" or "ion"?

"ion" is the more common of the two: it sits at frequency rank #5,604 in our English list, against #45,988 for "ies". The two are close in frequency, so neither is a safe default; check the meaning rather than guessing.

Remembering ies vs ion

The fastest way to pick the right one every time.

Read both glosses above and match the meaning you intend, only context separates this pair.
See each word in full, definition, IPA, etymology and its other confusables. Full “ies” entry
Browse more pairs most likely to be confused. Most confusable