13-Letter Words Matching __I_____O____

There are 18 13-letter words that match __I_____O____. 9 are common words, such as CHILDPROOFING and CLIMATOLOGIES. A rarer one is TRINUCLEOTIDE. 2 words contain a doubled letter.

Full list 18

childproofingclimatologiesclimatologistcriminologiescriminologistflirtatiouslyphilharmonicsreincorporatetriceratopsesknickerbockerprimatologiesthigmotropismwhithersoeverepitheliomataepizootiologyprimatologisttriamcinolonetrinucleotide

About this list

Words
18 (9 common words)
Common example
childproofing
Rare example
trinucleotide
Doubled letters
2
Ending in S
5

Questions

How many 13-letter words matching __i_____o____ are there?

18. 9 of them are common words.

What is a common example?

CHILDPROOFING is among the common words in this set.