mer vs my, What's the Difference?

Which to use

“mer” is a noun and “my” is a determiner - they look or sound alike but fill different roles in a sentence.

#19,904
“mer” frequency rank: #27
“my” frequency rank: 19931
confusion score

Side-by-Side Comparison

Feature	mer	my
Definition	A repeat unit: a structural unit which through repetition forms a polymer.	First-person singular possessive determiner. See Appendix:Possessive#English.

Letter map: mer vs my

Shared letters muted; letters that set mer and my apart highlighted. Shared run: 1.

3 ch

mer

2 ch

Role in the sentence - mer and my

Our dataset has no pronunciation recorded for both members, so the reliable separator here is grammatical: mer is anoun and myadeterminer. On the page they differ by 1 letter(s) in length. Our composite confusion score for this pair is 19931, derived from the frequency rank of both members and their visual similarity.

mer is recorded at frequency rank #19,904, classified as anoun. my is at rank #27, tagged as adet, pronounced /maɪ/.

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 19931, this pair ranks #434,698 of 530,003 scored English confusable pairs - a relatively easy-to-tell-apart pair.

Orthographic DNA of mer vs my

Shared letters: m. Private to "mer": er. Private to "my": y.

"mer" · 3 letters · shape CVC · "my" · 2 letters · shape CV

Frequently Asked Questions

Can "mer" and "my" be used interchangeably?

No - they are not even the same part of speech. "mer" is a noun and "my" a determiner, so a sentence built for one is usually ungrammatical with the other.

Which is more common, "mer" or "my"?

"my" is the more common of the two: it sits at frequency rank #27 in our English list, against #19,904 for "mer". That is a wide gap, so in ordinary text the rarer spelling is the one worth double-checking.

After this comparison

You've compared "mer" and "my". Here's where to go from here.

Full dictionary entry for "mer" with definition, IPA, and generated misspellings. Word entry
Full dictionary entry for "my" - compare definitions side by side with the headword page. Word entry
This pair ranks #434,698 of 530,003 scored English confusable pairs in this corpus vintage. Corpus statistics
"mer" and "my" also get mixed up with nearby pairs, the highest-scored neighbour is "mer vs MMP". Nearby pair

Confusion rank #434,698 of 530,003 scored English pairs, corpus vintage 2026-09-03, not spelling advice.