13-Letter Words Matching ___I___O_____

There are 36 13-letter words that match ___I___O_____. 10 are common words, such as BRAINSTORMING and MUSICOLOGICAL. A rarer one is VARIATIONALLY. In this set, S is the most frequent open letter (30 words). 6 words contain a doubled letter.

Full list 36

Common words

brainstormingmusicologicalmusicologistsofficeholderspolicyholdersradioisotopessemiautomaticsocioeconomictoxicologicaltoxicologistsactinomorphicdeviationisms
brainstormingmusicologicalmusicologistsofficeholderspolicyholdersradioisotopessemiautomaticsocioeconomictoxicologicaltoxicologistsactinomorphicdeviationismsdeviationistsheliotropismslexicologistsradiationallysinistrocularstoichiometrytrainspotterstrainspottingundiagnosableanticolonialsantinepotismsantithrombinsbrainstormerscodicologicalpalindromistspediculosisesradiationlessradiobiologicradioisotopicradiothoriumsreticulocytessolicitorshipstringcoursesvariationally

About this list

Words
36 (10 common words)
Common example
brainstorming
Rare example
variationally
Doubled letters
6
Ending in S
20
Most frequent letter
S (30)

Questions

How many 13-letter words matching ___i___o_____ are there?

36. 10 of them are common words.

What is a common example?

BRAINSTORMING is among the common words in this set.