12-Letter Words Matching ___F___O____

There are 12 12-letter words that match ___F___O____. 3 are common words, such as COFFEEHOUSES and PERFIDIOUSLY. A rarer one is TRIFOLIOLATE. In this set, I is the most frequent open letter (10 words). 6 words contain a doubled letter.

Full list 12

coffeehousesperfidiouslyprofessorialperfusionistprefectorialprofessorateunifoliolatediffusionismdiffusionistnonfrivolousprofessoriattrifoliolate

About this list

Words
12 (3 common words)
Common example
coffeehouses
Rare example
trifoliolate
Doubled letters
6
Ending in S
2
Most frequent letter
I (10)

Questions

How many 12-letter words matching ___f___o____ are there?

12. 3 of them are common words.

What is a common example?

COFFEEHOUSES is among the common words in this set.