13-Letter Words Matching ______R_M____

There are 20 13-letter words that match ______R_M____. 4 are common words, such as ACCOUTREMENTS and DEPROGRAMMING. A rarer one is SUPERPREMIUMS. In this set, A is the most frequent open letter (18 words). 8 words contain a doubled letter.

Full list 20

accoutrementsdeprogrammingmonochromaticreprogrammingaccelerometergynandromorphhomochromaticpolychromaticsaccharometerantithrombinscounterimagesdeprogrammersmetachromaticmonochromatormonochromistspalindromistssaccharimetersaccharomycessupercriminalsuperpremiums

About this list

Words
20 (4 common words)
Common example
accoutrements
Rare example
superpremiums
Doubled letters
8
Ending in S
8
Most frequent letter
A (18)

Questions

How many 13-letter words matching ______r_m____ are there?

20. 4 of them are common words.

What is a common example?

ACCOUTREMENTS is among the common words in this set.