12-Letter Words Matching ______UM____

There are 13 12-letter words that match ______UM____. 2 are common words, such as ALPHANUMERIC and DISENCUMBERS. A rarer one is TRANSHUMANTS. In this set, N is the most frequent open letter (12 words). 1 words contain a doubled letter.

Full list 13

alphanumericdisencumberscirrocumulusglenohumeralinconsumableovertrumpingsuperhumanlytranshumanceinconsumablyneurohumoralnonargumentsnonincumbenttranshumants

About this list

Words
13 (2 common words)
Common example
alphanumeric
Rare example
transhumants
Doubled letters
1
Ending in S
4
Most frequent letter
N (12)

Questions

How many 12-letter words matching ______um____ are there?

13. 2 of them are common words.

What is a common example?

ALPHANUMERIC is among the common words in this set.