9-Letter Words Matching ____S__M_

There are 17 9-letter words that match ____S__M_. 4 are common words, such as ACCUSTOMS and COCKSCOMB. A rarer one is UNWISDOMS. 4 words contain a doubled letter.

Full list 17

accustomscockscombcoliseumscolostomytimestampaltissimoileostomyimpostumemeristemsmonostomeperistomebluestemsclassismscrossarmshypostomepipestemsunwisdoms

About this list

Words
17 (4 common words)
Common example
accustoms
Rare example
unwisdoms
Doubled letters
4
Ending in S
8

Questions

How many 9-letter words matching ____s__m_ are there?

17. 4 of them are common words.

What is a common example?

ACCUSTOMS is among the common words in this set.