15-Letter Words Matching ______L___R____

There are 18 15-letter words that match ______L___R____. 4 are common words, such as DISCIPLINARIANS and MICROELECTRONIC. A rarer one is SUBPROLETARIATS. In this set, I is the most frequent open letter (17 words). 4 words contain a doubled letter.

Full list 18

disciplinariansmicroelectronicnitroglycerinesnonbelligerentscrystallographyphotoelectricalpiezoelectricalantimilitarismsantimilitaristsinterelectrodesinterelectronicmicroelectrodesnonbelligerencynonutilitariansphotoelectronicpremillenarianssemicylindricalsubproletariats

About this list

Words
18 (4 common words)
Common example
disciplinarians
Rare example
subproletariats
Doubled letters
4
Ending in S
10
Most frequent letter
I (17)

Questions

How many 15-letter words matching ______l___r____ are there?

18. 4 of them are common words.

What is a common example?

DISCIPLINARIANS is among the common words in this set.