10-Letter Words Matching __E_F_____

There are 20 10-letter words that match __E_F_____. 10 are common words, such as INEFFICACY and OVERFILLED. A rarer one is STEPFAMILY. In this set, R is the most frequent open letter (18 words). 6 words contain a doubled letter.

Full list 20

inefficacyoverfilledoverflightoverflowedoverflyingreenforcedreenforcesstepfatherunenforcedviewfinderdeepfreezedeepfrozenphenforminoverfacileoverfavorsoverfearedoverfishedoverfishesoverfundedstepfamily

About this list

Words
20 (10 common words)
Common example
inefficacy
Rare example
stepfamily
Doubled letters
6
Ending in S
3
Most frequent letter
R (18)

Questions

How many 10-letter words matching __e_f_____ are there?

20. 10 of them are common words.

What is a common example?

INEFFICACY is among the common words in this set.