13-Letter Words Matching ____A_____O__

There are 34 13-letter words that match ____A_____O__. 11 are common words, such as COLLABORATORS and CONTAMINATORS. A rarer one is ULTRACAUTIOUS. In this set, S is the most frequent open letter (31 words). 4 words contain a doubled letter.

Full list 34

Common words

collaboratorscontaminatorsdisharmoniousimplantationsinflammationsingratiationsinstallationsinstantaneousoverambitiousprevaricatorsreevaluationsbalsamiferous
collaboratorscontaminatorsdisharmoniousimplantationsinflammationsingratiationsinstallationsinstantaneousoverambitiousprevaricatorsreevaluationsbalsamiferouscalcariferousconfabulatoryinstaurationsjuglandaceouspolyadelphousproparoxytonesulfathiazoletetrastichouscoadaptationsconfabulatorscontainerportdeflagrationsdeglaciationsdermabrasionsexplantationsextrapolatorsextraversionshebraizationsreplantationssympathectomytetradynamousultracautious

About this list

Words
34 (11 common words)
Common example
collaborators
Rare example
ultracautious
Doubled letters
4
Ending in S
29
Most frequent letter
S (31)

Questions

How many 13-letter words matching ____a_____o__ are there?

34. 11 of them are common words.

What is a common example?

COLLABORATORS is among the common words in this set.