15-Letter Words Matching ______I_____O__

There are 18 15-letter words that match ______I_____O__. 5 are common words, such as DISAFFILIATIONS and PULCHRITUDINOUS. A rarer one is UNFOSSILIFEROUS. In this set, S is the most frequent open letter (17 words). 7 words contain a doubled letter.

Full list 18

disaffiliationspulchritudinousreconciliationsreconfirmationstransmigrationsasclepiadaceousdefibrillationsdissatisfactoryinfundibuliformphotomicroscopeultramicroscopevicissitudinousdisambiguationsinterdiffusionsinterlineationspoststimulatoryredistillationsunfossiliferous

About this list

Words
18 (5 common words)
Common example
disaffiliations
Rare example
unfossiliferous
Doubled letters
7
Ending in S
13
Most frequent letter
S (17)

Questions

How many 15-letter words matching ______i_____o__ are there?

18. 5 of them are common words.

What is a common example?

DISAFFILIATIONS is among the common words in this set.