15-Letter Words Matching __O________N___

There are 21 15-letter words that match __O________N___. 7 are common words, such as COOPERATIVENESS and INOFFENSIVENESS. A rarer one is TROUBLESOMENESS. 19 words contain a doubled letter.

Full list 21

cooperativenessinoffensivenessprogressivenessprovocativenessthoughtlessnessunobtrusivenesswrongheadednessbroadmindednesschoriocarcinomagoodheartednessinopportunenessodoriferousnessprohibitivenesspromiscuousnesspronunciamentosbloodguiltinessemotionlessnessfloriferousnessinoperativenessspontaneousnesstroublesomeness

About this list

Words
21 (7 common words)
Common example
cooperativeness
Rare example
troublesomeness
Doubled letters
19
Ending in S
20

Questions

How many 15-letter words matching __o________n___ are there?

21. 7 of them are common words.

What is a common example?

COOPERATIVENESS is among the common words in this set.