12-Letter Words Matching __I_______O_

There are 21 12-letter words that match __I_______O_. 8 are common words, such as CHIAROSCUROS and CHIROPRACTOR. A rarer one is UNIONISATION. In this set, N is the most frequent open letter (18 words). 4 words contain a doubled letter.

Full list 21

chiaroscuroschiropractoreviscerationneighborhoodphilodendronprimogenitorspinsterhoodunionizationalimentationepithalamionreimpositionreimpressionscintillatorstigmasteroltripartitiontriplicationdeionizationreinspectiontrichlorphontrifurcationunionisation

About this list

Words
21 (8 common words)
Common example
chiaroscuros
Rare example
unionisation
Doubled letters
4
Ending in S
1
Most frequent letter
N (18)

Questions

How many 12-letter words matching __i_______o_ are there?

21. 8 of them are common words.

What is a common example?

CHIAROSCUROS is among the common words in this set.