13-Letter Words Matching ___IO________

There are 79 13-letter words that match ___IO________. 35 are common words, such as AMNIOCENTESES and AMNIOCENTESIS. A rarer one is VARIOUSNESSES. In this set, E is the most frequent open letter (61 words). 20 words contain a doubled letter.

Full list 79

Common words

amniocentesesamniocentesisangioplastiesanxiousnessesbiliousnessescopiousnessescuriousnessesdeviousnessesdubiousnessesenviousnesseshagiographershagiographies
amniocentesesamniocentesisangioplastiesanxiousnessesbiliousnessescopiousnessescuriousnessesdeviousnessesdubiousnessesenviousnesseshagiographershagiographiesimpiousnessesinviolabilitynationalisticnationalitiesnationalizingobviousnessesperiodicitiesperiodontistspoliomyelitisradioactivelyradioactivityradiographersradiographiesradioisotopesratiocinatingratiocinationrationalisticrationalitiesrationalizingseriousnessessocioeconomictediousnessesviciousnessesaggiornamentoangiographiesaudiocassetteheliographingheliotropismsinviolatenessnoxiousnessesperiodizationpoliomyeliticradioactivateradiochemicalradiogalaxiesradiolocationradiotelegramratiocinativeratiocinatorssocioculturalsociometricalvisionarinessangiospermousantiobesitiesantiobscenitynationalisingnationalizersnotionalitiesoptionalitiesperiodontallyperiostitidesperiostitisesradiobiologicradiochemistsradioelementsradiographingradioisotopicradiolabelingradiolabelledradionuclidesradiothoriumsrationalisingrationalizersregionalisticregionalizingsociolinguistvariousnesses

About this list

Words
79 (35 common words)
Common example
amniocenteses
Rare example
variousnesses
Doubled letters
20
Ending in S
45
Most frequent letter
E (61)

Questions

How many 13-letter words matching ___io________ are there?

79. 35 of them are common words.

What is a common example?

AMNIOCENTESES is among the common words in this set.