15-Letter Words Matching ____I_O________

There are 25 15-letter words that match ____I_O________. 3 are common words, such as CARCINOGENICITY and CARNIVOROUSNESS. A rarer one is WORRISOMENESSES. In this set, S is the most frequent open letter (22 words). 9 words contain a doubled letter.

Full list 25

Common words

carcinogenicitycarnivorousnessplenipotentiarycaprifoliaceouscorticosteroidscorticosteronesfideicommissaryglutinousnessesphysicochemicalaluminosilicateapolipoproteinscarcinosarcomas
carcinogenicitycarnivorousnessplenipotentiarycaprifoliaceouscorticosteroidscorticosteronesfideicommissaryglutinousnessesphysicochemicalaluminosilicateapolipoproteinscarcinosarcomascorticotrophinsfibrinopeptidesmultipolaritiespantisocraticalpantisocratistsplatinocyanidespostinoculationterritorialismsterritorialiststerritorializedterritorializeswearisomenessesworrisomenesses

About this list

Words
25 (3 common words)
Common example
carcinogenicity
Rare example
worrisomenesses
Doubled letters
9
Ending in S
17
Most frequent letter
S (22)

Questions

How many 15-letter words matching ____i_o________ are there?

25. 3 of them are common words.

What is a common example?

CARCINOGENICITY is among the common words in this set.