12-Letter Words Matching ____N_N_____

There are 29 12-letter words that match ____N_N_____. 13 are common words, such as BRAININESSES and BRAWNINESSES. A rarer one is VACANTNESSES. 25 words contain a doubled letter.

Full list 29

Common words

braininessesbrawninessesfemininitiesgraininesseshumanenessesintentnessesquaintnessesrecentnessesrotundnessesserenenessesskinninessesthorninesses
braininessesbrawninessesfemininitiesgraininesseshumanenessesintentnessesquaintnessesrecentnessesrotundnessesserenenessesskinninessesthorninessesunkindnessesfemininenessjejunenessesboringnessesdaringnessesexponentialsimmanentismsimmanentistsinsanenesseslivingnesseslovingnessesnonunanimouspliantnessespregnenolonesilentnessessupinenessesvacantnesses

About this list

Words
29 (13 common words)
Common example
braininesses
Rare example
vacantnesses
Doubled letters
25
Ending in S
28

Questions

How many 12-letter words matching ____n_n_____ are there?

29. 13 of them are common words.

What is a common example?

BRAININESSES is among the common words in this set.