r's vs RFA, What's the Difference?

Which to use

“r's” is a noun and “RFA” is a name - they look or sound alike but fill different roles in a sentence.

#40,861
“r's” frequency rank: #42,382
“RFA” frequency rank: 83243
confusion score

Side-by-Side Comparison

Feature	r's	RFA
Definition	plural of r	Initialism of Royal Fleet Auxiliary.

Letter map: r's vs RFA

Shared letters muted; letters that set r's and RFA apart highlighted. Shared run: 1. r's runs 2 letters (CC) against RFA's 3 (CCV) - the length gap alone is often enough to separate them once you know to check it.

3 ch

r's

3 ch

RFA

Grammar separator: r's vs RFA

Our dataset has no pronunciation recorded for both members, so the reliable separator here is grammatical: r's is anoun and RFAaname. On the page they share most of their letters but differ in 2 positions. Our composite confusion score for this pair is 83243, derived from the frequency rank of both members and their visual similarity.

r's is recorded at frequency rank #40,861, classified as anoun. RFA is at rank #42,382, tagged as aname.

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 83243, this pair ranks #14,200 of 530,003 scored English confusable pairs - among the most confusable pairs.

Orthographic DNA of r's vs RFA

Shared letters: r. Private to "r's": s. Private to "RFA": af.

"r's" · 2 letters · shape CC · "RFA" · 3 letters · shape CCV

Frequently Asked Questions

Is swapping "r's" for "RFA" ever safe?

No - they are not even the same part of speech. "r's" is a noun and "RFA" a name, so a sentence built for one is usually ungrammatical with the other.

In ordinary English text, does "r's" or "RFA" show up more?

"r's" is the more common of the two: it sits at frequency rank #40,861 in our English list, against #42,382 for "RFA". The two are close in frequency, so neither is a safe default; check the meaning rather than guessing.

After this comparison

You've compared "r's" and "RFA". Here's where to go from here.

Full dictionary entry for "r's" with definition, IPA, and generated misspellings. Word entry
Full dictionary entry for "RFA" - compare definitions side by side with the headword page. Word entry
This pair ranks #14,200 of 530,003 scored English confusable pairs in this corpus vintage. Corpus statistics
"r's" and "RFA" also get mixed up with nearby pairs, the highest-scored neighbour is "RFA vs Rua". Nearby pair

Confusion rank #14,200 of 530,003 scored English pairs, corpus vintage 2026-09-03, not spelling advice.