13-Letter Words Matching __I____O_____

There are 22 13-letter words that match __I____O_____. 6 are common words, such as CHILDPROOFING and CRISSCROSSING. A rarer one is UNIDEOLOGICAL. In this set, I is the most frequent open letter (18 words). 3 words contain a doubled letter.

Full list 22

childproofingcrisscrossingreinvigoratedreinvigoratesseismologicalseismologistsdeipnosophistepiphenomenonanisotropismsepidemiologicepileptogenicepiphenomenalorismologicalprivatdocentsprivatdozentspsittacosisesreinvigoratortricarboxylictrichinosisestrichologiststrimethoprimsunideological

About this list

Words
22 (6 common words)
Common example
childproofing
Rare example
unideological
Doubled letters
3
Ending in S
9
Most frequent letter
I (18)

Questions

How many 13-letter words matching __i____o_____ are there?

22. 6 of them are common words.

What is a common example?

CHILDPROOFING is among the common words in this set.