11-Letter Words Matching I____O_____

There are 29 11-letter words that match I____O_____. 10 are common words, such as IDEOLOGICAL and IDEOLOGISTS. A rarer one is ISALLOBARIC. In this set, R is the most frequent open letter (20 words). 13 words contain a doubled letter.

Full list 29

Common words

ideologicalideologistsimmunologicinopportuneinterofficeinvigoratedinvigoratesirremovableirrevocableirrevocablyidiomorphicimmunoassay
ideologicalideologistsimmunologicinopportuneinterofficeinvigoratedinvigoratesirremovableirrevocableirrevocablyidiomorphicimmunoassayimmunogenicinfusoriansinterocularintraocularironmongersironmongeryironworkersirresolubleisopropanolidempotentsideologizedideologizesimmunoblotsinscrollinginvigoratorirremovablyisallobaric

About this list

Words
29 (10 common words)
Common example
ideological
Rare example
isallobaric
Doubled letters
13
Ending in S
8
Most frequent letter
R (20)

Questions

How many 11-letter words matching i____o_____ are there?

29. 10 of them are common words.

What is a common example?

IDEOLOGICAL is among the common words in this set.