13-Letter Words Matching ____S_____O__

There are 29 13-letter words that match ____S_____O__. 15 are common words, such as FENESTRATIONS and ILLUSTRATIONS. A rarer one is TRANSFECTIONS. In this set, T is the most frequent open letter (27 words). 9 words contain a doubled letter.

Full list 29

Common words

fenestrationsillustrationsindiscretionsinvestigatorsinvestigatoryirresolutionsjurisdictionsministrationsregistrationsrepossessionsresuscitatorssatisfactions
fenestrationsillustrationsindiscretionsinvestigatorsinvestigatoryirresolutionsjurisdictionsministrationsregistrationsrepossessionsresuscitatorssatisfactionsspinsterhoodstransgressorstransmissionsclaustrophobecrassulaceousendoskeletonsexpostulatorynumismatologypolysyndetonstransductionstransudationsassassinatorscleistogamouscytoskeletonsreassumptionsreinspectionstransfections

About this list

Words
29 (15 common words)
Common example
fenestrations
Rare example
transfections
Doubled letters
9
Ending in S
25
Most frequent letter
T (27)

Questions

How many 13-letter words matching ____s_____o__ are there?

29. 15 of them are common words.

What is a common example?

FENESTRATIONS is among the common words in this set.