9-Letter Words Matching ____S__I_

There are 31 9-letter words that match ____S__I_. 10 are common words, such as BACKSTAIR and BOATSWAIN. A rarer one is TEARSTAIN. In this set, A is the most frequent open letter (20 words). 6 words contain a doubled letter.

Full list 31

Common words

backstairboatswainbrasseriechrysalisfilmstripparasiticrhapsodicsemisolidsinusitistransshipbreastpinchrysalid
backstairboatswainbrasseriechrysalisfilmstripparasiticrhapsodicsemisolidsinusitistransshipbreastpinchrysalidcockswaincopaseticcrosshairdigastricglossitisgrassquitmeniscoidtransonicandesiticcopeseticcytosolicdiopsidicgneissoidlandsleitlatosolicmonosomicpraesidiarefuseniktearstain

About this list

Words
31 (10 common words)
Common example
backstair
Rare example
tearstain
Doubled letters
6
Ending in S
3
Most frequent letter
A (20)

Questions

How many 9-letter words matching ____s__i_ are there?

31. 10 of them are common words.

What is a common example?

BACKSTAIR is among the common words in this set.