15-Letter Words Matching _U________O____

There are 13 15-letter words that match _U________O____. 4 are common words, such as BURGLARPROOFING and PUSILLANIMOUSLY. A rarer one is SUCCINYLCHOLINE. In this set, S is the most frequent open letter (12 words). 5 words contain a doubled letter.

Full list 13

burglarproofingpusillanimouslysuperstitiouslysurreptitiouslyautotransformermultitudinouslysuperheterodynesuperpatriotismautochthonouslysubreptitiouslysubstitutionarysubterraneouslysuccinylcholine

About this list

Words
13 (4 common words)
Common example
burglarproofing
Rare example
succinylcholine
Doubled letters
5
Ending in S
0
Most frequent letter
S (12)

Questions

How many 15-letter words matching _u________o____ are there?

13. 4 of them are common words.

What is a common example?

BURGLARPROOFING is among the common words in this set.