13-Letter Words Matching __MU_________

There are 14 13-letter words that match __MU_________. 4 are common words, such as IMMUNIZATIONS and IMMUNOLOGICAL. A rarer one is IMMUTABLENESS. In this set, I is the most frequent open letter (13 words). 10 words contain a doubled letter.

Full list 14

immunizationsimmunologicalimmunologistsremunerationscumulostratusimmunotherapydemultiplexergemutlichkeitimmunochemistimmunogenesesimmunogenesisimmunogeneticimmunosorbentimmutableness

About this list

Words
14 (4 common words)
Common example
immunizations
Rare example
immutableness
Doubled letters
10
Ending in S
7
Most frequent letter
I (13)

Questions

How many 13-letter words matching __mu_________ are there?

14. 4 of them are common words.

What is a common example?

IMMUNIZATIONS is among the common words in this set.