13-Letter Words Matching ____IO_______

There are 57 13-letter words that match ____IO_______. 18 are common words, such as AMELIORATIONS and BIBLIOGRAPHER. A rarer one is TENSIOMETRIES. In this set, I is the most frequent open letter (49 words). 11 words contain a doubled letter.

Full list 57

Common words

ameliorationsbibliographerbibliographiccardiologistsemotionalismsemotionalizedemotionalizesfactionalismsfictionalizedfictionalizesmillionnairespassionflower
ameliorationsbibliographerbibliographiccardiologistsemotionalismsemotionalizedemotionalizesfactionalismsfictionalizedfictionalizesmillionnairespassionflowerpatrioticallyphysiognomiesphysiologicalphysiologistsphysiotherapysectionalismsaperiodicallybibliolatriesbibliotherapycardiologicalglaciologicalglaciologistsherniorrhaphymillionairesspassionlesslyphysiographerphysiographicstationmastersymbioticallytheriomorphicvitriolicallybibliolatrousbibliomaniacsbibliopegistsbibliophiliesbibliophilismbibliopolistscardiographiccardiopathiescraniometriesemotionalistsemotionlesslyexobiologicalexobiologistsfashionmongerfictionalisedfictionalisesfictioneeringhomoiothermicmultiorgasmicnonbiologicalnonbiologistsopinionatedlyprebiologicaltensiometries

About this list

Words
57 (18 common words)
Common example
ameliorations
Rare example
tensiometries
Doubled letters
11
Ending in S
25
Most frequent letter
I (49)

Questions

How many 13-letter words matching ____io_______ are there?

57. 18 of them are common words.

What is a common example?

AMELIORATIONS is among the common words in this set.