9-Letter Words Matching ___O__F__

There are 13 9-letter words that match ___O__F__. 5 are common words, such as CALORIFIC and HONORIFIC. A rarer one is UNHOPEFUL. In this set, R is the most frequent open letter (9 words). 3 words contain a doubled letter.

Full list 13

calorifichonorificreposefulsoporificspoonsfulcolorificeffortfulsaporificsudorifictamoxifenvaporificscoopsfulunhopeful

About this list

Words
13 (5 common words)
Common example
calorific
Rare example
unhopeful
Doubled letters
3
Ending in S
0
Most frequent letter
R (9)

Questions

How many 9-letter words matching ___o__f__ are there?

13. 5 of them are common words.

What is a common example?

CALORIFIC is among the common words in this set.