15-Letter Words Matching __I_________I__

There are 21 15-letter words that match __I_________I__. 3 are common words, such as MAINTAINABILITY and REINCORPORATING. A rarer one is TRIFLUOPERAZINE. 3 words contain a doubled letter.

Full list 21

maintainabilityreincorporatingreincorporationcriminalizationepiscopalianismoligonucleotideoligosaccharidequincentenariesreinvestigationubiquitarianismdeindustrializeepigrammatizingepithelializingepizootiologiesoligomerizationphilanthropoidsquintuplicatingreindustrializereinvestigatingtriangularitiestrifluoperazine

About this list

Words
21 (3 common words)
Common example
maintainability
Rare example
trifluoperazine
Doubled letters
3
Ending in S
4

Questions

How many 15-letter words matching __i_________i__ are there?

21. 3 of them are common words.

What is a common example?

MAINTAINABILITY is among the common words in this set.