15-Letter Words Matching ______R__U_____

There are 18 15-letter words that match ______R__U_____. 6 are common words, such as ILLUSTRIOUSNESS and INCONGRUOUSNESS. A rarer one is THERMOREGULATOR. In this set, O is the most frequent open letter (18 words). 8 words contain a doubled letter.

Full list 18

illustriousnessincongruousnessindustriousnessmeritoriousnessredistributionsunderproductiondeleteriousnesshyperproductionmisattributionsnonmatriculatednonreproduciblenonreproductiveopprobriousnessphotoproductiontemerariousnessthermoregulatedthermoregulatesthermoregulator

About this list

Words
18 (6 common words)
Common example
illustriousness
Rare example
thermoregulator
Doubled letters
8
Ending in S
10
Most frequent letter
O (18)

Questions

How many 15-letter words matching ______r__u_____ are there?

18. 6 of them are common words.

What is a common example?

ILLUSTRIOUSNESS is among the common words in this set.