9-Letter Words Matching _____M_U_

There are 13 9-letter words that match _____M_U_. 3 are common words, such as ANONYMOUS and NEODYMIUM. A rarer one is NONCAMPUS. In this set, O is the most frequent open letter (11 words). 0 words contain a doubled letter.

Full list 13

anonymousneodymiumunanimouseponymousexogamousgelsemiumginormousunharmfulapogamousbeglamourbonhomousisogamousnoncampus

About this list

Words
13 (3 common words)
Common example
anonymous
Rare example
noncampus
Doubled letters
0
Ending in S
9
Most frequent letter
O (11)

Questions

How many 9-letter words matching _____m_u_ are there?

13. 3 of them are common words.

What is a common example?

ANONYMOUS is among the common words in this set.