ill vs IVA, What's the Difference?

Which to use

“ill” is an adjective and “IVA” is an abbrev - they look or sound alike but fill different roles in a sentence.

#44,899
“ill” frequency rank: #21,221
“IVA” frequency rank: 66120
confusion score

Side-by-Side Comparison

Feature	ill	IVA
Definition	doente	sigla de Imposto sobre o Valor Acrescentado

Where the spellings diverge

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

3 ch

ill

3 ch

IVA

Spelling & Dictionary Insight

These two trip readers on the page rather than in the ear: ill is /ɪl/ while IVA is /ˈivɜ/. Spoken aloud the problem disappears. In writing it persists, because they share most of their letters but differ in 2 positions, and the parts of speech differ too (adjective vs abbrev), which is usually the fastest check. Our composite confusion score for this pair is 66120, derived from the frequency rank of both members and their visual similarity.

ill is recorded at frequency rank #44,899, classified as anadj, pronounced /ɪl/. IVA is at rank #21,221, tagged as anabbrev, pronounced /ˈivɜ/.

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 66120, this pair ranks #5,105 of 75,631 scored Portuguese confusable pairs - among the most confusable pairs.

Orthographic DNA of ill vs IVA

Shared letters: i. Private to "ill": l. Private to "IVA": av.

"ill" · 3 letters · shape VCC · "IVA" · 3 letters · shape VCV

Frequency comparison

ill#44,899

IVA#21,221

Source: FrequencyWords open word-frequency list

Frequently Asked Questions

Can "ill" and "IVA" be used interchangeably?

No - they are not even the same part of speech. "ill" is an adjective and "IVA" an abbrev, so a sentence built for one is usually ungrammatical with the other.

Which is more common, "ill" or "IVA"?

"IVA" is the more common of the two: it sits at frequency rank #21,221 in our Portuguese list, against #44,899 for "ill". The two are close in frequency, so neither is a safe default; check the meaning rather than guessing.

Remembering ill vs IVA

The fastest way to pick the right one every time.

Check the role first: if you need an adjective, it's “ill”; for an abbrev, it's “IVA”.
See each word in full, definition, IPA, etymology and its other confusables. Full “ill” entry
Browse more pairs most likely to be confused. Most confusable