10-Letter Words Matching _____UM___

There are 18 10-letter words that match _____UM___. 4 are common words, such as INSTRUMENT and INTEGUMENT. A rarer one is REARGUMENT. In this set, I is the most frequent open letter (13 words). 6 words contain a doubled letter.

Full list 18

instrumentintegumentposthumousunassumingaltocumulibuckjumperdispluminghoodlumismichneumonsreassumingcoassumingduraluminshoodlumishouttrumpedovalbuminsoverpumpedquadrumvirreargument

About this list

Words
18 (4 common words)
Common example
instrument
Rare example
reargument
Doubled letters
6
Ending in S
4
Most frequent letter
I (13)

Questions

How many 10-letter words matching _____um___ are there?

18. 4 of them are common words.

What is a common example?

INSTRUMENT is among the common words in this set.