15-Letter Words Matching ____O_A________

There are 52 15-letter words that match ____O_A________. 8 are common words, such as ELABORATENESSES and IMPROBABILITIES. A rarer one is VISIONARINESSES. In this set, I is the most frequent open letter (50 words). 16 words contain a doubled letter.

Full list 52

Common words

elaboratenessesimprobabilitiesinviolabilitiesmicromanagementnationalizationprovocativenessrationalizationtemporarinessesadenocarcinomasastronauticallyastronavigationferromagnetisms
elaboratenessesimprobabilitiesinviolabilitiesmicromanagementnationalizationprovocativenessrationalizationtemporarinessesadenocarcinomasastronauticallyastronavigationferromagnetismshomeopathicallyinexorabilitiesoligosaccharideosteopathicallypersonalizationchemotacticallychemotaxonomieschemotaxonomistcustomarinessesdiagonalizationdisposabilitiesemployabilitiesferromanganeseshistopathologicimprovabilitiesinviolatenessesmicrobarographsmicroearthquakemicrogametocytemicroradiographmisvocalizationnecromanticallyneuropathicallyneuropathologicnontotalitarianpaleomagnetismspaleomagnetistspentobarbitonesphenobarbitonesphonocardiogramphototacticallyphytopathogenicpromotabilitiesreasonabilitiesregionalizationsacrosanctitiessubvocalizationthyrocalcitoninunknowabilitiesvisionarinesses

About this list

Words
52 (8 common words)
Common example
elaboratenesses
Rare example
visionarinesses
Doubled letters
16
Ending in S
25
Most frequent letter
I (50)

Questions

How many 15-letter words matching ____o_a________ are there?

52. 8 of them are common words.

What is a common example?

ELABORATENESSES is among the common words in this set.