15-Letter Words Matching S____R_________

There are 17 15-letter words that match S____R_________. 3 are common words, such as SEAWORTHINESSES and SEMITRANSPARENT. A rarer one is SYNCHRONOUSNESS. In this set, S is the most frequent open letter (16 words). 5 words contain a doubled letter.

Full list 17

seaworthinessessemitransparentsynchronizationspectroscopicalsubstratospheresynchronicitiessemicrystallinesemitranslucentsilversmithingssinterabilitiessolderabilitiesspectrographiesspectroscopistssubterraneouslysulfurousnessessynchronisationsynchronousness

About this list

Words
17 (3 common words)
Common example
seaworthinesses
Rare example
synchronousness
Doubled letters
5
Ending in S
9
Most frequent letter
S (16)

Questions

How many 15-letter words matching s____r_________ are there?

17. 3 of them are common words.

What is a common example?

SEAWORTHINESSES is among the common words in this set.