15-Letter Words Matching _O________O____

There are 21 15-letter words that match _O________O____. 7 are common words, such as CONSCIENTIOUSLY and CONSERVATIONISM. A rarer one is ROENTGENOLOGIST. In this set, T is the most frequent open letter (20 words). 4 words contain a doubled letter.

Full list 21

conscientiouslyconservationismconservationistconstitutionalsconstructionistnoninflationarytonsillectomiescontradictorilycountermelodiescolonizationistcomputerphobiasconsentaneouslycontainerboardscontradictoriescounterreformermontmorillonitenoncontemporarynonprofessorialpolyelectrolyteroentgenologiesroentgenologist

About this list

Words
21 (7 common words)
Common example
conscientiously
Rare example
roentgenologist
Doubled letters
4
Ending in S
7
Most frequent letter
T (20)

Questions

How many 15-letter words matching _o________o____ are there?

21. 7 of them are common words.

What is a common example?

CONSCIENTIOUSLY is among the common words in this set.