13-Letter Words Matching U_________O__

There are 14 13-letter words that match U_________O__. 6 are common words, such as UNADVENTUROUS and UNCEREMONIOUS. A rarer one is UREDINIOSPORE. In this set, S is the most frequent open letter (14 words). 2 words contain a doubled letter.

Full list 14

unadventurousunceremoniousunionizationsunlikelihoodsunpretentiousurbanizationsumbelliferousuncontentiousuglificationsultracautiousumbilicationsunionisationsurbanisationsurediniospore

About this list

Words
14 (6 common words)
Common example
unadventurous
Rare example
urediniospore
Doubled letters
2
Ending in S
13
Most frequent letter
S (14)

Questions

How many 13-letter words matching u_________o__ are there?

14. 6 of them are common words.

What is a common example?

UNADVENTUROUS is among the common words in this set.