15-Letter Words Matching S___________A__

There are 13 15-letter words that match S___________A__. 2 are common words, such as SEPTUAGENARIANS and STRAIGHTFORWARD. A rarer one is SUBSTITUTIONARY. 1 words contain a doubled letter.

Full list 13

septuagenariansstraightforwardsesquicarbonatesesquipedalianssimplicidentatesubcontraoctavesabermetricianssemicentennialssemidocumentarysesquicentenarysolitudinarianssubproletariatssubstitutionary

About this list

Words
13 (2 common words)
Common example
septuagenarians
Rare example
substitutionary
Doubled letters
1
Ending in S
6

Questions

How many 15-letter words matching s___________a__ are there?

13. 2 of them are common words.

What is a common example?

SEPTUAGENARIANS is among the common words in this set.