13-Letter Words Matching _X________O__

There are 20 13-letter words that match _X________O__. 9 are common words, such as EXACERBATIONS and EXAGGERATIONS. A rarer one is EXTRAVERSIONS. 1 words contain a doubled letter.

Full list 20

exacerbationsexaggerationsexasperationsexhilarationsexpatriationsexploitationsexpropriatorsexterminatorsextroversionsexcruciationsexpostulatoryexterminatoryexanthematousexcogitationsexenterationsexercitationsexplantationsexteroceptorsextrapolatorsextraversions

About this list

Words
20 (9 common words)
Common example
exacerbations
Rare example
extraversions
Doubled letters
1
Ending in S
18

Questions

How many 13-letter words matching _x________o__ are there?

20. 9 of them are common words.

What is a common example?

EXACERBATIONS is among the common words in this set.