13-Letter Words Matching ________S__A_

There are 21 13-letter words that match ________S__A_. 6 are common words, such as ASTROPHYSICAL and INFINITESIMAL. A rarer one is ULTRAPHYSICAL. In this set, L is the most frequent open letter (19 words). 6 words contain a doubled letter.

Full list 21

astrophysicalinfinitesimalinterpersonallackadaisicalunderclassmanupperclassmanantichristianhyperphysicallowerclassmanpostclassicalsemiclassicalsubperiostealsuperphysicalanticlassicalgynecomastiasintrapersonalmicrophysicalpolyribosomalsuperpersonaltranspersonalultraphysical

About this list

Words
21 (6 common words)
Common example
astrophysical
Rare example
ultraphysical
Doubled letters
6
Ending in S
1
Most frequent letter
L (19)

Questions

How many 13-letter words matching ________s__a_ are there?

21. 6 of them are common words.

What is a common example?

ASTROPHYSICAL is among the common words in this set.