15-Letter Words Matching __E_R__________

There are 12 15-letter words that match __E_R__________. 3 are common words, such as CHEERLESSNESSES and PREARRANGEMENTS. A rarer one is PREPRESIDENTIAL. 10 words contain a doubled letter.

Full list 12

cheerlessnessesprearrangementsunearthlinessesoverrefinementsoverrepresentedpleuropneumoniapreprofessionalclearheadednessepeirogenicallyexecrablenessesoverregulationsprepresidential

About this list

Words
12 (3 common words)
Common example
cheerlessnesses
Rare example
prepresidential
Doubled letters
10
Ending in S
7

Questions

How many 15-letter words matching __e_r__________ are there?

12. 3 of them are common words.

What is a common example?

CHEERLESSNESSES is among the common words in this set.