15-Letter Words Matching I_____R________

There are 30 15-letter words that match I_____R________. 12 are common words, such as ILLUSTRIOUSNESS and IMMATERIALITIES. A rarer one is IRREFORMABILITY. In this set, N is the most frequent open letter (27 words). 13 words contain a doubled letter.

Full list 30

Common words

illustriousnessimmaterialitiesimpoverishmentsincomprehensionincongruousnessindeterminaciesindeterminatelyindoctrinationsindustrializingindustriousnessinsubordinationinterpretations
illustriousnessimmaterialitiesimpoverishmentsincomprehensionincongruousnessindeterminaciesindeterminatelyindoctrinationsindustrializingindustriousnessinsubordinationinterpretationsimmaterializingincomprehensiveindeterminationinopportunenessinsubordinatelyintrapreneurialirreparablenessirreversibilityilliberalnessesinalterablenessindeterministicindustrialisinginseparablenessinterfraternityintergradationsinterprovincialintolerablenessirreformability

About this list

Words
30 (12 common words)
Common example
illustriousness
Rare example
irreformability
Doubled letters
13
Ending in S
15
Most frequent letter
N (27)

Questions

How many 15-letter words matching i_____r________ are there?

30. 12 of them are common words.

What is a common example?

ILLUSTRIOUSNESS is among the common words in this set.