15-Letter Words Matching ________S_I____

There are 13 15-letter words that match ________S_I____. 2 are common words, such as NONPROFESSIONAL and SUBPROFESSIONAL. A rarer one is VISCOELASTICITY. 6 words contain a doubled letter.

Full list 13

nonprofessionalsubprofessionalecclesiasticismnoncommissionedphotoelasticitypreprofessionalretrogressivelybiostatisticianmicroseismicitynoncombustiblespostdivestituresuperplasticityviscoelasticity

About this list

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

Questions

How many 15-letter words matching ________s_i____ are there?

13. 2 of them are common words.

What is a common example?

NONPROFESSIONAL is among the common words in this set.