12-Letter Words Matching _R_____O____

There are 104 12-letter words that match _R_____O____. 34 are common words, such as ARCHEOLOGIES and ARCHEOLOGIST. A rarer one is TRYPSINOGENS. In this set, I is the most frequent open letter (84 words). 20 words contain a doubled letter.

Full list 104

Common words

archeologiesarcheologistbraggadociosbrainstormedcrapshooterscrisscrossedcrisscrossesgraphologiesgraphologistgratuitouslygreengrocersgregariously
archeologiesarcheologistbraggadociosbrainstormedcrapshooterscrisscrossedcrisscrossesgraphologiesgraphologistgratuitouslygreengrocersgregariouslypraiseworthyprecariouslyprecociouslypredisposingprehistoriespreschoolerspresupposingprobationaryprobationersprodigiouslyprofessorialpromontoriespropitiouslyprosperouslyprotectorateprovisioningtraitorouslytrajectoriestrapshootingtremendouslyurbanologiesurbanologistarchiphonemebranchiopodsbreechloadercraniotomiescreditworthygrallatorialgraveclothesgreengroceryorthorhombicorthotropouspreceptorialprefectorialprehistorianproctologiesproctologistprofessorateprothonotaryprototrophicprotozoologyprovisionerstraditionarytraditionisttrainspottertransitorilytrichomonadstrophozoitesarchesporialarchesporiumbrainstormercraniologiescryptococcalcryptococcuscryptologiescryptologistgranodioritekremlinologyorganologiesorismologiespraxeologiespreapprovingprecensoringprecentorialpreceptoriesprecisionistprediscoveryprednisolonepregnenoloneprevisionaryprevisioningprivatdocentprivatdozentprofessoriatprogestogenspropranololsprosauropodsprotectoriesprovisionalsprovisionarytrapshooterstrichologiestrichologisttrichotomiestrichotomoustrifoliolatetrimethoprimtrimetrogonstriphthongaltropomyosinstruncheoningtrypsinogens

About this list

Words
104 (34 common words)
Common example
archeologies
Rare example
trypsinogens
Doubled letters
20
Ending in S
39
Most frequent letter
I (84)

Questions

How many 12-letter words matching _r_____o____ are there?

104. 34 of them are common words.

What is a common example?

ARCHEOLOGIES is among the common words in this set.