12-Letter Words Matching _____UM_____

There are 13 12-letter words that match _____UM_____. 6 are common words, such as INSTRUMENTAL and INSTRUMENTED. A rarer one is REASSUMPTION. In this set, N is the most frequent open letter (12 words). 3 words contain a doubled letter.

Full list 13

instrumentalinstrumentedposthumouslyunassuminglyundocumentedunencumberedantihumanismintegumentalquadrumanousthingumabobsthingumajigsphillumenistreassumption

About this list

Words
13 (6 common words)
Common example
instrumental
Rare example
reassumption
Doubled letters
3
Ending in S
3
Most frequent letter
N (12)

Questions

How many 12-letter words matching _____um_____ are there?

13. 6 of them are common words.

What is a common example?

INSTRUMENTAL is among the common words in this set.