10-Letter Words Matching ____O___O_

There are 50 10-letter words that match ____O___O_. 18 are common words, such as BUTTONWOOD and COMPOSITOR. A rarer one is PREPORTION. In this set, R is the most frequent open letter (34 words). 15 words contain a doubled letter.

Full list 50

Common words

buttonwoodcompositorconcoctioncontortioncottonwooddistortionevaporatorimbrogliosimprovisornationhoodnincompooppercolator
buttonwoodcompositorconcoctioncontortioncottonwooddistortionevaporatorimbrogliosimprovisornationhoodnincompooppercolatorphenomenonproportionrhinocerosschoolbookschoolroomservomotorbuttonhookcarbonadoscatholiconcollocutorcorporatordiaconicondragonrootelaboratorgorgoneionharmoniconinchoationmatronhoodoculomotorovipositorperforatorphotofloodprepositorprolocutorreadoptionresponsionribbonwoodsyncopatoryellowwoodbiocontrolcatholicoicatholicosmelioratorneurohumorpersonatorpersonhoodpoisonwoodpreportion

About this list

Words
50 (18 common words)
Common example
buttonwood
Rare example
preportion
Doubled letters
15
Ending in S
4
Most frequent letter
R (34)

Questions

How many 10-letter words matching ____o___o_ are there?

50. 18 of them are common words.

What is a common example?

BUTTONWOOD is among the common words in this set.