8-Letter Words Matching ___N_F__

There are 12 8-letter words that match ___N_F__. 7 are common words, such as EVENTFUL and SPINOFFS. A rarer one is VAUNTFUL. In this set, T is the most frequent open letter (8 words). 2 words contain a doubled letter.

Full list 12

eventfulspinoffsthankfultransfertransfixturnoffswrongfulmagnificspinifexstoneflytrunkfulvauntful

About this list

Words
12 (7 common words)
Common example
eventful
Rare example
vauntful
Doubled letters
2
Ending in S
2
Most frequent letter
T (8)

Questions

How many 8-letter words matching ___n_f__ are there?

12. 7 of them are common words.

What is a common example?

EVENTFUL is among the common words in this set.