13-Letter Words Matching ____U__U_____

There are 16 13-letter words that match ____U__U_____. 5 are common words, such as CREDULOUSNESS and GARRULOUSNESS. A rarer one is SULFUROUSNESS. In this set, S is the most frequent open letter (16 words). 9 words contain a doubled letter.

Full list 16

credulousnessgarrulousnessquerulousnesstremulousnessventurousnessabsquatulatedabsquatulatesapiculturistsconsuetudinalaviculturistscircumfusionsharquebusierspendulousnessrapturousnesssubculturallysulfurousness

About this list

Words
16 (5 common words)
Common example
credulousness
Rare example
sulfurousness
Doubled letters
9
Ending in S
13
Most frequent letter
S (16)

Questions

How many 13-letter words matching ____u__u_____ are there?

16. 5 of them are common words.

What is a common example?

CREDULOUSNESS is among the common words in this set.