9-Letter Words Starting With IRR

There are 20 9-letter words that start with IRR. 13 are common words, such as IRRADIATE and IRREGULAR. A rarer one is IRRIDENTA. In this set, I is the most frequent open letter (18 words). 20 words contain a doubled letter.

Full list 20

irradiateirregularirrigableirrigatedirrigatesirritableirritablyirritantsirritatedirritatesirruptingirruptionirruptiveirradiantirrigatorirriguousirritatorirrealityirredentairridenta

About this list

Words
20 (13 common words)
Common example
irradiate
Rare example
irridenta
Doubled letters
20
Ending in S
4
Most frequent letter
I (18)

Questions

How many 9-letter words starting with irr are there?

20. 13 of them are common words.

What is a common example?

IRRADIATE is among the common words in this set.