9-Letter Words Matching __T_F____

There are 20 9-letter words that match __T_F____. 12 are common words, such as ARTEFACTS and ARTIFACTS. A rarer one is RUTHFULLY. In this set, I is the most frequent open letter (14 words). 6 words contain a doubled letter.

Full list 20

artefactsartifactsartificerartificesdutifullyfatefullyhatefullynotifiersnotifyingpitifullyratifiersratifyingantefixescitifyingestafetteantefixaeantifraudgatefoldslutefisksruthfully

About this list

Words
20 (12 common words)
Common example
artefacts
Rare example
ruthfully
Doubled letters
6
Ending in S
8
Most frequent letter
I (14)

Questions

How many 9-letter words matching __t_f____ are there?

20. 12 of them are common words.

What is a common example?

ARTEFACTS is among the common words in this set.