15-Letter Words Matching ______T__O_____

There are 18 15-letter words that match ______T__O_____. 2 are common words, such as PALEONTOLOGISTS and PHILANTHROPISTS. A rarer one is RHEUMATOLOGISTS. In this set, I is the most frequent open letter (16 words). 2 words contain a doubled letter.

Full list 18

paleontologistsphilanthropistsdessertspoonfulpaleontologicalphilanthropicalsubcontraoctaveantimetabolitesdialectologicaldialectologistsendometriosisesexoerythrocyticholometabolismsoverwithholdingparasitologicalparasitologistsphenylthioureasphilanthropoidsrheumatologists

About this list

Words
18 (2 common words)
Common example
paleontologists
Rare example
rheumatologists
Doubled letters
2
Ending in S
10
Most frequent letter
I (16)

Questions

How many 15-letter words matching ______t__o_____ are there?

18. 2 of them are common words.

What is a common example?

PALEONTOLOGISTS is among the common words in this set.