Which to use
“filling” is a verb and “fueling” is a noun - they look or sound alike but fill different roles in a sentence.
- #5,221
- “filling” frequency rank
- #23,838
- “fueling” frequency rank
- 29059
- confusion score
Side-by-Side Comparison
| Feature | filling | fueling |
|---|---|---|
| Definition | present participle and gerund of fill | The act or process by which something is fueled. |
Letter map: filling vs fueling
Shared letters muted; letters that set filling and fueling apart highlighted. Shared run: 5.
Grammar separator: filling vs fueling
Our dataset has no pronunciation recorded for both members, so the reliable separator here is grammatical: filling is averb and fuelinganoun. On the page they share most of their letters but differ in 2 positions. Our composite confusion score for this pair is 29059, derived from the frequency rank of both members and their visual similarity.
filling is recorded at frequency rank #5,221, classified as averb, pronounced /ˈfɪlɪŋ/. fueling is at rank #23,838, tagged as anoun.
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 29059, this pair ranks #366,138 of 530,003 scored English confusable pairs - roughly mid-pack for confusability.
Orthographic DNA of filling vs fueling
Shared letters: fgiln. Private to "filling": -. Private to "fueling": eu.
"filling" · 7 letters · shape CVCCVCC · "fueling" · 7 letters · shape CVVCVCC
Known mistypes of this pair
Frequently Asked Questions
Is swapping "filling" for "fueling" ever safe?
In ordinary English text, does "filling" or "fueling" show up more?
What to do next
You've compared "filling" and "fueling". Here's where to go from here.
- Full dictionary entry for "filling" with definition, IPA, and generated misspellings. Word entry
- Full dictionary entry for "fueling" - compare definitions side by side with the headword page. Word entry
- This pair ranks #366,138 of 530,003 scored English confusable pairs in this corpus vintage. Corpus statistics
- "filling" and "fueling" also get mixed up with nearby pairs, the highest-scored neighbour is "fueling vs Fuelling". Nearby pair
- Recorded mistypes exist for at least one side of this pair, useful when a spell-checker or OCR lands on the wrong form. See mistypes
Confusion rank #366,138 of 530,003 scored English pairs, corpus vintage 2026-09-03, not spelling advice.