15-Letter Words Matching S___O__________

There are 20 15-letter words that match S___O__________. 3 are common words, such as SEAWORTHINESSES and SERVOMECHANISMS. A rarer one is SUBVOCALIZATION. In this set, I is the most frequent open letter (18 words). 6 words contain a doubled letter.

Full list 20

seaworthinessesservomechanismssorrowfulnessessaprophyticallyservomechanicalsociobiologicalsociobiologistssociolinguisticsubcontraoctavesyllogisticallysacrosanctitiessaprogenicitiesschlockmeistersschoolmasterishsigmoidoscopiessocioculturallysociohistoricalsteroidogenesessteroidogenesissubvocalization

About this list

Words
20 (3 common words)
Common example
seaworthinesses
Rare example
subvocalization
Doubled letters
6
Ending in S
10
Most frequent letter
I (18)

Questions

How many 15-letter words matching s___o__________ are there?

20. 3 of them are common words.

What is a common example?

SEAWORTHINESSES is among the common words in this set.