12-Letter Words Matching __O_N_______

There are 20 12-letter words that match __O_N_______. 5 are common words, such as CLOWNISHNESS and GROUNDLESSLY. A rarer one is PROGNATHISMS. In this set, S is the most frequent open letter (18 words). 10 words contain a doubled letter.

Full list 20

clownishnessgroundlesslygroundswellsgroundwatersthorninessesgroundclothsgroundmassesgroundsheetsgroundspeedsscornfulnessspoonfeedingunornamentedbioenergeticbioengineersgroundburstsgroundfishesisoantigenicisoenzymaticmyoinositolsprognathisms

About this list

Words
20 (5 common words)
Common example
clownishness
Rare example
prognathisms
Doubled letters
10
Ending in S
14
Most frequent letter
S (18)

Questions

How many 12-letter words matching __o_n_______ are there?

20. 5 of them are common words.

What is a common example?

CLOWNISHNESS is among the common words in this set.