15-Letter Words Matching ____I___O______

There are 13 15-letter words that match ____I___O______. 2 are common words, such as CARNIVOROUSNESS and MELLIFLUOUSNESS. A rarer one is HELMINTHOLOGIES. In this set, N is the most frequent open letter (13 words). 12 words contain a doubled letter.

Full list 13

carnivorousnessmellifluousnesscommissionairesduplicitousnessinquisitoriallyodoriferousnesspestiferousnessprecipitousnesspromiscuousnesscombinatoriallyfissiparousnessfloriferousnesshelminthologies

About this list

Words
13 (2 common words)
Common example
carnivorousness
Rare example
helminthologies
Doubled letters
12
Ending in S
11
Most frequent letter
N (13)

Questions

How many 15-letter words matching ____i___o______ are there?

13. 2 of them are common words.

What is a common example?

CARNIVOROUSNESS is among the common words in this set.