15-Letter Words Matching ____IO_________

There are 21 15-letter words that match ____IO_________. 5 are common words, such as BIBLIOGRAPHICAL and CARDIOPULMONARY. A rarer one is PHYSIOPATHOLOGY. In this set, A is the most frequent open letter (20 words). 10 words contain a doubled letter.

Full list 21

bibliographicalcardiopulmonaryphysiologicallyphysiotherapiesphysiotherapistchoriocarcinomafashionablenessmillionairessespassionlessnessphysiographicalbibliotherapieschorioallantoicchorioallantoisdithiocarbamateemotionlessnessfictionizationsmissionizationsnonbiographicalnonbiologicallyopinionatednessphysiopathology

About this list

Words
21 (5 common words)
Common example
bibliographical
Rare example
physiopathology
Doubled letters
10
Ending in S
10
Most frequent letter
A (20)

Questions

How many 15-letter words matching ____io_________ are there?

21. 5 of them are common words.

What is a common example?

BIBLIOGRAPHICAL is among the common words in this set.