15-Letter Words Matching _R___O_________

There are 23 15-letter words that match _R___O_________. 4 are common words, such as PREADOLESCENCES and PROGNOSTICATING. A rarer one is TRICHOMONACIDES. In this set, I is the most frequent open letter (21 words). 10 words contain a doubled letter.

Full list 23

preadolescencesprognosticatingprognosticationprognosticatorscrossopterygianirrevocablenessorganophosphatepreprofessionalprognosticatorytribromoethanolarcheologicallycryptorchidismscryptozoologiescryptozoologistirreconcilablesirreformabilityorganochlorinesorganomercurialorganometallicsprognosticativeproteolyticallytrichomonacidaltrichomonacides

About this list

Words
23 (4 common words)
Common example
preadolescences
Rare example
trichomonacides
Doubled letters
10
Ending in S
9
Most frequent letter
I (21)

Questions

How many 15-letter words matching _r___o_________ are there?

23. 4 of them are common words.

What is a common example?

PREADOLESCENCES is among the common words in this set.