12-Letter Words Matching _____RU_____

There are 24 12-letter words that match _____RU_____. 12 are common words, such as CARBORUNDUMS and CONSTRUCTING. A rarer one is UNDERRUNNING. In this set, N is the most frequent open letter (21 words). 10 words contain a doubled letter.

Full list 24

carborundumsconstructingconstructionconstructiveconstructorsfrontrunnersinterruptersinterruptinginterruptionmenstruatingmenstruationsubstructurecrossruffingincorruptioninterruptiveovertrumpingantipruriticantitrustersdaunorubicininterruptorsoutthrustingposteruptiveprestructureunderrunning

About this list

Words
24 (12 common words)
Common example
carborundums
Rare example
underrunning
Doubled letters
10
Ending in S
6
Most frequent letter
N (21)

Questions

How many 12-letter words matching _____ru_____ are there?

24. 12 of them are common words.

What is a common example?

CARBORUNDUMS is among the common words in this set.