15-Letter Words Matching __O_________O__

There are 20 15-letter words that match __O_________O__. 3 are common words, such as PROCRASTINATORS and PROGNOSTICATORS. A rarer one is PHOTOREDUCTIONS. 3 words contain a doubled letter.

Full list 20

procrastinatorsprognosticatorsreorganizationsbioremediationscholecystectomychoriocarcinomaphotomicroscopeprocrastinatoryprognosticatoryproprioceptionsbiodegradationsbronchodilatorschorioallantoicchorioallantoisgeometrizationslyophilizationsphotoinductionsphotooxidationsphotoreceptionsphotoreductions

About this list

Words
20 (3 common words)
Common example
procrastinators
Rare example
photoreductions
Doubled letters
3
Ending in S
14

Questions

How many 15-letter words matching __o_________o__ are there?

20. 3 of them are common words.

What is a common example?

PROCRASTINATORS is among the common words in this set.