12-Letter Words Matching _S_______S__

There are 18 12-letter words that match _S_______S__. 6 are common words, such as ASTIGMATISMS and ASTROLOGISTS. A rarer one is USABLENESSES. In this set, S is the most frequent open letter (18 words). 3 words contain a doubled letter.

Full list 18

astigmatismsastrologistsastutenessesosteoporosesosteoporosisusefulnessesastragalusesisomorphismsosteogenesispsychognosisesotericismsestheticismsisochronismsosteogenesesosteologistspseudocyesespseudocyesisusablenesses

About this list

Words
18 (6 common words)
Common example
astigmatisms
Rare example
usablenesses
Doubled letters
3
Ending in S
18
Most frequent letter
S (18)

Questions

How many 12-letter words matching _s_______s__ are there?

18. 6 of them are common words.

What is a common example?

ASTIGMATISMS is among the common words in this set.