13-Letter Words Matching ____I___R____

There are 21 13-letter words that match ____I___R____. 3 are common words, such as COMMISSARIATS and PREHISTORICAL. A rarer one is SUBLIBRARIANS. 5 words contain a doubled letter.

Full list 21

commissariatsprehistoricalprofiteeringsclavichordistgravimetricalmarsipobranchmultivibratornonfilterablenonhistoricalprehistorianstheriomorphicveggieburgerscorticotropinmultibarreledmulticurrencynondiscursivenondispersivenonlibrariansoverinformingpantisocraticsublibrarians

About this list

Words
21 (3 common words)
Common example
commissariats
Rare example
sublibrarians
Doubled letters
5
Ending in S
6

Questions

How many 13-letter words matching ____i___r____ are there?

21. 3 of them are common words.

What is a common example?

COMMISSARIATS is among the common words in this set.