10-Letter Words Matching ______IF__

There are 20 10-letter words that match ______IF__. 12 are common words, such as CHAIRLIFTS and DOWNSHIFTS. A rarer one is UMBELLIFER. 5 words contain a doubled letter.

Full list 20

chairliftsdownshiftsgearshiftsjackknifedjackknifesmakeshiftsnightlifesplaintiffsscientificsnowdriftsunmercifulunspecificfrigorificpinnatifidspindriftstenebrifictorporificblueshiftshousewifeyumbellifer

About this list

Words
20 (12 common words)
Common example
chairlifts
Rare example
umbellifer
Doubled letters
5
Ending in S
10

Questions

How many 10-letter words matching ______if__ are there?

20. 12 of them are common words.

What is a common example?

CHAIRLIFTS is among the common words in this set.