13-Letter Words Matching ____O__N_____

There are 110 13-letter words that match ____O__N_____. 51 are common words, such as AMNIOCENTESES and AMNIOCENTESIS. A rarer one is WELCOMENESSES. In this set, E is the most frequent open letter (94 words). 55 words contain a doubled letter.

Full list 110

Common words

amniocentesesamniocentesisamorousnessesanxiousnessesarduousnessesawesomenessesbiliousnessescallousnessescopiousnessescuriousnessescursorinessesdeviousnesses
amniocentesesamniocentesisamorousnessesanxiousnessesarduousnessesawesomenessesbiliousnessescallousnessescopiousnessescuriousnessescursorinessesdeviousnessesdubiousnessesenviousnessesethnocentrismfatuousnessesfulsomenessesheinousnesseshideousnesseshydrodynamicshydrogenatinghydrogenationimpiousnessesirksomenessesmicromanagingnervousnessesobviousnessesominousnessesonerousnessesorthodontistsorthogonalityperiodontistsphilodendronspiteousnessespompousnessespredominancespredominantlypredominatingprimogenitorsprimogenitureratiocinatingratiocinationraucousnessesrhododendronsseriousnessestediousnessestenuousnessesvacuousnessesviciousnesseswinsomenesseszealousnessesandrogynouslyastrodynamicsconsonantallydipsomaniacaleusporangiateferroconcreteforlornnessesgibbousnesseshydrokineticslissomenessesmicromanagersnitrobenzenesnoisomenessesnoxiousnessespathogenicityphenomenalismphenomenologyphotodynamicsphotomontagespredominatelypredominationprimogenitaryprotolanguageratiocinativeratiocinatorssacrosanctityshadowinessessinuousnessesuniformnessesviscousnessesemulousnesseseugeosynclinegaseousnessesingrownnessesjealousnessesmicrofungusesmicropuncturemicrotonalitynormotensivesodorousnessesoperosenessesorthogonalizeperiodontallyphenomenalistphotofinisherphotoionizingphotosynthateprenominatingprenominationpretournamentrhodomontadesriotousnessesruinousnessessaprogenicitysensorineuralsociolinguistvariousnessesverbosenesseswelcomenesses

About this list

Words
110 (51 common words)
Common example
amniocenteses
Rare example
welcomenesses
Doubled letters
55
Ending in S
71
Most frequent letter
E (94)

Questions

How many 13-letter words matching ____o__n_____ are there?

110. 51 of them are common words.

What is a common example?

AMNIOCENTESES is among the common words in this set.