14-Letter Words Matching __FR__________

There are 12 14-letter words that match __FR__________. 3 are common words, such as INFRASTRUCTURE and REFRIGERATIONS. A rarer one is REFRANGIBILITY. In this set, I is the most frequent open letter (11 words). 4 words contain a doubled letter.

Full list 12

infrastructurerefrigerationsunfriendlinessinfralapsarianinfrangibilityrefractivenessrefractivitiesrefractometersrefractorinessunfruitfulnessrefractometricrefrangibility

About this list

Words
12 (3 common words)
Common example
infrastructure
Rare example
refrangibility
Doubled letters
4
Ending in S
7
Most frequent letter
I (11)

Questions

How many 14-letter words matching __fr__________ are there?

12. 3 of them are common words.

What is a common example?

INFRASTRUCTURE is among the common words in this set.