13-Letter Words Matching _M_U_________

There are 13 13-letter words that match _M_U_________. 4 are common words, such as IMMUNIZATIONS and IMMUNOLOGICAL. A rarer one is IMPULSIVITIES. In this set, I is the most frequent open letter (13 words). 11 words contain a doubled letter.

Full list 13

immunizationsimmunologicalimmunologistsimpulsivenessimmunotherapyombudsmanshipimmunochemistimmunogenesesimmunogenesisimmunogeneticimmunosorbentimmutablenessimpulsivities

About this list

Words
13 (4 common words)
Common example
immunizations
Rare example
impulsivities
Doubled letters
11
Ending in S
7
Most frequent letter
I (13)

Questions

How many 13-letter words matching _m_u_________ are there?

13. 4 of them are common words.

What is a common example?

IMMUNIZATIONS is among the common words in this set.