12-Letter Words Matching I____O______

There are 22 12-letter words that match I____O______. 8 are common words, such as IMMEMORIALLY and IMMUNOLOGIES. A rarer one is INVIGORATORS. In this set, N is the most frequent open letter (18 words). 11 words contain a doubled letter.

Full list 22

immemoriallyimmunologiesimmunologistindecorouslyinvigoratinginvigorationirresolutelyirresolutionillusorinessinfamousnessinteroceptorinteroperateinvigorativeirreformableirresolvableisopropanolsideologizingimmunoassaysinappositelyinteroceanicinterorbitalinvigorators

About this list

Words
22 (8 common words)
Common example
immemorially
Rare example
invigorators
Doubled letters
11
Ending in S
6
Most frequent letter
N (18)

Questions

How many 12-letter words matching i____o______ are there?

22. 8 of them are common words.

What is a common example?

IMMEMORIALLY is among the common words in this set.