11-Letter Words Matching _S____O____

There are 20 11-letter words that match _S____O____. 8 are common words, such as ASSIDUOUSLY and ASTROLOGERS. A rarer one is OSTEOLOGIST. In this set, I is the most frequent open letter (16 words). 3 words contain a doubled letter.

Full list 20

assiduouslyastrologersastrologiesastrologistastronomersastronomiesescallopingescritoireseschatologyaspersoriumasthenopiasisochronismisochronizeisochronousoscillogramostensoriumostracodermescharoticsosteologiesosteologist

About this list

Words
20 (8 common words)
Common example
assiduously
Rare example
osteologist
Doubled letters
3
Ending in S
9
Most frequent letter
I (16)

Questions

How many 11-letter words matching _s____o____ are there?

20. 8 of them are common words.

What is a common example?

ASSIDUOUSLY is among the common words in this set.