15-Letter Words Matching _____R____O____

There are 24 15-letter words that match _____R____O____. 8 are common words, such as CONSERVATIONISM and CONSERVATIONIST. A rarer one is SUBTERRANEOUSLY. In this set, S is the most frequent open letter (23 words). 8 words contain a doubled letter.

Full list 24

conservationismconservationistconstructionistendocrinologiesendocrinologistinsurrectionistinterrogatoriespreservationistautotransformerdessertspoonfuldisharmoniouslygeochronologistgeomorphologiesinsurrectionaryinterrogatorilypreservationismresurrectionismresurrectionistvespertilionineelectrodepositsgeochronologiesgeomorphologistpreformationistsubterraneously

About this list

Words
24 (8 common words)
Common example
conservationism
Rare example
subterraneously
Doubled letters
8
Ending in S
5
Most frequent letter
S (23)

Questions

How many 15-letter words matching _____r____o____ are there?

24. 8 of them are common words.

What is a common example?

CONSERVATIONISM is among the common words in this set.