12-Letter Words Matching ________SO__

There are 20 12-letter words that match ________SO__. 6 are common words, such as CHAIRPERSONS and EXTRASENSORY. A rarer one is VASOPRESSORS. 7 words contain a doubled letter.

Full list 20

chairpersonsextrasensoryintercessorsintercessorypredecessorssalespersonschondriosomecoprocessorseuchromosomecorepressorshandypersonshousepersonsintersensorymultisensoryneurosensorypolyribosomerepossessorssuperpersonssupersensoryvasopressors

About this list

Words
20 (6 common words)
Common example
chairpersons
Rare example
vasopressors
Doubled letters
7
Ending in S
11

Questions

How many 12-letter words matching ________so__ are there?

20. 6 of them are common words.

What is a common example?

CHAIRPERSONS is among the common words in this set.