11-Letter Words Matching _____IR____

There are 18 11-letter words that match _____IR____. 5 are common words, such as CONSPIRATOR and REAFFIRMING. A rarer one is UNEMPIRICAL. In this set, E is the most frequent open letter (16 words). 3 words contain a doubled letter.

Full list 18

conspiratorreaffirmingsemicirclesundesirableundesirablyechovirusessapphirinesarbovirusesduumviratesmyxovirusesoutwhirlingoverdirectsovergirdingquagmiriestredshirtingrotavirusesunaspiratedunempirical

About this list

Words
18 (5 common words)
Common example
conspirator
Rare example
unempirical
Doubled letters
3
Ending in S
8
Most frequent letter
E (16)

Questions

How many 11-letter words matching _____ir____ are there?

18. 5 of them are common words.

What is a common example?

CONSPIRATOR is among the common words in this set.