14-Letter Words Matching _____I___O____

There are 22 14-letter words that match _____I___O____. 3 are common words, such as BOARDINGHOUSES and CLEARINGHOUSES. A rarer one is XENODIAGNOSTIC. In this set, S is the most frequent open letter (20 words). 4 words contain a doubled letter.

Full list 22

boardinghousesclearinghousesconspiratorialassociationismbioclimatologycountinghousesinfelicitouslylabyrinthodontparasitologistquadrillionthsquintillionthsassociationistkremlinologieskremlinologistmetafictionistnonphilosopherparasitologiesrepudiationistrestrictionismrestrictionistserodiagnosticxenodiagnostic

About this list

Words
22 (3 common words)
Common example
boardinghouses
Rare example
xenodiagnostic
Doubled letters
4
Ending in S
7
Most frequent letter
S (20)

Questions

How many 14-letter words matching _____i___o____ are there?

22. 3 of them are common words.

What is a common example?

BOARDINGHOUSES is among the common words in this set.