15-Letter Words Matching __C__________S_

There are 12 15-letter words that match __C__________S_. 3 are common words, such as INCONGRUOUSNESS and PICTURESQUENESS. A rarer one is UNCONCERNEDNESS. 12 words contain a doubled letter.

Full list 12

incongruousnesspicturesquenessunconsciousnessaccountablenessecclesiasticismincredulousnessdichotomousnessdictatorialnessexceptionalnessnecessitousnessunclimbablenessunconcernedness

About this list

Words
12 (3 common words)
Common example
incongruousness
Rare example
unconcernedness
Doubled letters
12
Ending in S
11

Questions

How many 15-letter words matching __c__________s_ are there?

12. 3 of them are common words.

What is a common example?

INCONGRUOUSNESS is among the common words in this set.