10-Letter Words Matching ______U_O_

There are 12 10-letter words that match ______U_O_. 4 are common words, such as INSTITUTOR and PERSECUTOR. A rarer one is SOSTENUTOS. In this set, T is the most frequent open letter (11 words). 2 words contain a doubled letter.

Full list 12

institutorpersecutorpolitburosprosecutorattributorcoexecutorcollocutormotoneuronprolocutorethambutolneurohumorsostenutos

About this list

Words
12 (4 common words)
Common example
institutor
Rare example
sostenutos
Doubled letters
2
Ending in S
2
Most frequent letter
T (11)

Questions

How many 10-letter words matching ______u_o_ are there?

12. 4 of them are common words.

What is a common example?

INSTITUTOR is among the common words in this set.