15-Letter Words Matching _____I____O____

There are 16 15-letter words that match _____I____O____. 4 are common words, such as CONSCIENTIOUSLY and CONSTITUTIONALS. A rarer one is THYROIDECTOMIES. In this set, S is the most frequent open letter (16 words). 3 words contain a doubled letter.

Full list 16

conscientiouslyconstitutionalsperspicaciouslysanctimoniouslyadenoidectomiesassimilationistmastoidectomiessesquicarbonateassimilationismcolonizationistcontainerboardsemancipationistinefficaciouslysigmoidoscopiessubstitutionarythyroidectomies

About this list

Words
16 (4 common words)
Common example
conscientiously
Rare example
thyroidectomies
Doubled letters
3
Ending in S
6
Most frequent letter
S (16)

Questions

How many 15-letter words matching _____i____o____ are there?

16. 4 of them are common words.

What is a common example?

CONSCIENTIOUSLY is among the common words in this set.