15-Letter Words Matching __S_______O____

There are 17 15-letter words that match __S_______O____. 5 are common words, such as DISCONTINUOUSLY and INSTANTANEOUSLY. A rarer one is HISTOPHYSIOLOGY. In this set, I is the most frequent open letter (16 words). 9 words contain a doubled letter.

Full list 17

discontinuouslyinstantaneouslyinsurrectionistmiscellaneouslypusillanimouslyassimilationistdessertspoonfuldisharmoniouslyinsurrectionarymastoidectomiesresurrectionismresurrectionistsesquicarbonatevespertilionineassimilationismdisinflationaryhistophysiology

About this list

Words
17 (5 common words)
Common example
discontinuously
Rare example
histophysiology
Doubled letters
9
Ending in S
1
Most frequent letter
I (16)

Questions

How many 15-letter words matching __s_______o____ are there?

17. 5 of them are common words.

What is a common example?

DISCONTINUOUSLY is among the common words in this set.