15-Letter Words Matching ____H_____O____

There are 13 15-letter words that match ____H_____O____. 3 are common words, such as OPHTHALMOLOGIES and OPHTHALMOLOGIST. A rarer one is PSYCHOHISTORIES. In this set, O is the most frequent open letter (13 words). 1 words contain a doubled letter.

Full list 13

ophthalmologiesophthalmologistweatherproofinggeochronologistpsychobiologistpsychoneuroticspsychopathologyecophysiologiesgeochronologieslymphosarcomatapsychobiologiespsychohistorianpsychohistories

About this list

Words
13 (3 common words)
Common example
ophthalmologies
Rare example
psychohistories
Doubled letters
1
Ending in S
6
Most frequent letter
O (13)

Questions

How many 15-letter words matching ____h_____o____ are there?

13. 3 of them are common words.

What is a common example?

OPHTHALMOLOGIES is among the common words in this set.