15-Letter Words Matching I_____O________

There are 35 15-letter words that match I_____O________. 14 are common words, such as IMPERIOUSNESSES and IMPETUOUSNESSES. A rarer one is IRRATIONALISTIC. In this set, N is the most frequent open letter (34 words). 23 words contain a doubled letter.

Full list 35

Common words

imperiousnessesimpetuousnessesinappropriatelyingeniousnessesingenuousnessesinnocuousnessesinsidiousnessesintercollegiateinterconnectinginterconnectioninterrogativelyinterrogatories
imperiousnessesimpetuousnessesinappropriatelyingeniousnessesingenuousnessesinnocuousnessesinsidiousnessesintercollegiateinterconnectinginterconnectioninterrogativelyinterrogatoriesinvidiousnessesirrationalitiesichthyosaurusesinconsolabilityindissolubilityinjuriousnessesintercommunionsinterconversioninterrogationalinterrogatorilyichthyosauriansimpersonalitiesimpersonalizingincuriousnessesintercomparisoninterconvertingintercorrelatedintercorrelatesinteriorizationintermodulationinterpopulationintrapopulationirrationalistic

About this list

Words
35 (14 common words)
Common example
imperiousnesses
Rare example
irrationalistic
Doubled letters
23
Ending in S
16
Most frequent letter
N (34)

Questions

How many 15-letter words matching i_____o________ are there?

35. 14 of them are common words.

What is a common example?

IMPERIOUSNESSES is among the common words in this set.