13-Letter Words Matching _________R_L_

There are 21 13-letter words that match _________R_L_. 4 are common words, such as INVOLUNTARILY and PERFUNCTORILY. A rarer one is UNCUSTOMARILY. 1 words contain a doubled letter.

Full list 21

involuntarilyperfunctorilysupernaturalsunnecessarilyacrylonitrileexplanatorilyextemporarilyfragmentarilypreliminarilyproprietarilydeprecatorilydocumentarilyinformatorilypremonitorilypreparatorilyprocathedralsrudimentarilyscalariformlystigmasterolsultraliberalsuncustomarily

About this list

Words
21 (4 common words)
Common example
involuntarily
Rare example
uncustomarily
Doubled letters
1
Ending in S
4

Questions

How many 13-letter words matching _________r_l_ are there?

21. 4 of them are common words.

What is a common example?

INVOLUNTARILY is among the common words in this set.