14-Letter Words Matching __T__F________

There are 16 14-letter words that match __T__F________. 5 are common words, such as NITRIFICATIONS and PETTIFOGGERIES. A rarer one is ULTRAFILTRATES. In this set, I is the most frequent open letter (15 words). 2 words contain a doubled letter.

Full list 16

nitrificationspettifoggeriessatisfactorilyvitrificationswatchfulnessesinterferometerinterferometrypetrificationsinterfacultiesinterferentialinterferogramsinterfertilitylithificationsretroflectionstetrafluoridesultrafiltrates

About this list

Words
16 (5 common words)
Common example
nitrifications
Rare example
ultrafiltrates
Doubled letters
2
Ending in S
11
Most frequent letter
I (15)

Questions

How many 14-letter words matching __t__f________ are there?

16. 5 of them are common words.

What is a common example?

NITRIFICATIONS is among the common words in this set.