13-Letter Words Matching ____S______I_

There are 22 13-letter words that match ____S______I_. 3 are common words, such as ANTISPASMODIC and IDIOSYNCRATIC. A rarer one is TRANSTHORACIC. 4 words contain a doubled letter.

Full list 22

antispasmodicidiosyncratictransatlanticantiscorbuticantisymmetriccounselorshipillusionisticmonosymmetricparasynthesispolysynthetictreasurershipassistantshipendosymbiosisendosymbiotichomoscedasticmegasporangiaparasitologicparasyntheticsemisynthetictenosynovitistransmountaintransthoracic

About this list

Words
22 (3 common words)
Common example
antispasmodic
Rare example
transthoracic
Doubled letters
4
Ending in S
3

Questions

How many 13-letter words matching ____s______i_ are there?

22. 3 of them are common words.

What is a common example?

ANTISPASMODIC is among the common words in this set.