15-Letter Words Matching ____O______S___

There are 29 15-letter words that match ____O______S___. 12 are common words, such as AIRWORTHINESSES and ANALOGOUSNESSES. A rarer one is VISIONARINESSES. In this set, N is the most frequent open letter (28 words). 24 words contain a doubled letter.

Full list 29

Common words

airworthinessesanalogousnessesdissolutenesseselaboratenessesexplosivenessesfrivolousnessesmicroaggressionmicroprocessorsphotosynthesizeseaworthinessessorrowfulnessestemporarinesses
airworthinessesanalogousnessesdissolutenesseselaboratenessesexplosivenessesfrivolousnessesmicroaggressionmicroprocessorsphotosynthesizeseaworthinessessorrowfulnessestemporarinessesconnoisseurshipcontortionisticphototransistorsociolinguisticclamorousnessescorporealnessescorrosivenessescustomarinessesglamorousnessesinviolatenessesoutdoorsmanshipphenomenalisticpictorialnessespromotivenessespurposivenessestomboyishnessesvisionarinesses

About this list

Words
29 (12 common words)
Common example
airworthinesses
Rare example
visionarinesses
Doubled letters
24
Ending in S
21
Most frequent letter
N (28)

Questions

How many 15-letter words matching ____o______s___ are there?

29. 12 of them are common words.

What is a common example?

AIRWORTHINESSES is among the common words in this set.