12-Letter Words Matching ____O__O____

There are 109 12-letter words that match ____O__O____. 32 are common words, such as BUTTONHOLING and CENSORIOUSLY. A rarer one is TROPOMYOSINS. In this set, I is the most frequent open letter (84 words). 17 words contain a doubled letter.

Full list 109

Common words

buttonholingcensoriouslycommodiouslycosponsoringcottonmouthscustomhousesdiscomforteddiscommodingdiscomposingdiscomposuredisconsolateeuphoniously
buttonholingcensoriouslycommodiouslycosponsoringcottonmouthscustomhousesdiscomforteddiscommodingdiscomposingdiscomposuredisconsolateeuphoniouslyhaemoglobinsharmoniouslyhydrophobiasingloriouslymacrobioticsmicrobiologymicrogroovesmicroscopiesnoncorrodingnoncorrosivenonpoisonouspaleontologypigeonholingprecociouslypromontoriesradioisotoperadioscopiesschoolhousesshadowboxingvictoriouslyanisotropiesastrobiologyastrogeologycannonfodderchemotropismcyclopropanecyclosporinediscommodityflavoproteinglucoproteinglycoproteingnotobioticsheliotropismhydrogeologyhydrotropismlactoproteinmicroprogrammicroscopistneurobiologynyctophobiasorthorhombicorthotropouspaleobiologypaleoecologypaleozoologyphototropismphysostomousphytobiologyprototrophicprotozoologyradiobiologyradiothoriumsociobiologyunifoliolateanisotropismbuttonholersbuttonhookedcarrottoppedctenophoranscystoscopiesdouroucoulisgranodioritehaptoglobinshydrobiologyluteotrophicluteotrophinluteotropinsmicrophonicsmicrosporousnegrophobiasnoncomposersnoncompoundsnonconformednonconformernoncorporateoligopsoniesoligotrophicpathobiologyphotobiologyphotogeologyphotophobiasphotoproductpigeonholerspittosporumspleiotropiesradioecologyresponsoriesrhinoscopiesrhizoctoniasschoolboyishsubcomponentthixotropiesthyrotrophicthyrotrophinthyrotropinstrifoliolatetropomyosins

About this list

Words
109 (32 common words)
Common example
buttonholing
Rare example
tropomyosins
Doubled letters
17
Ending in S
38
Most frequent letter
I (84)

Questions

How many 12-letter words matching ____o__o____ are there?

109. 32 of them are common words.

What is a common example?

BUTTONHOLING is among the common words in this set.