12-Letter Words Matching ____T____U__

There are 14 12-letter words that match ____T____U__. 3 are common words, such as ARBITRAGEURS and EINSTEINIUMS. A rarer one is STRATOCUMULI. In this set, S is the most frequent open letter (13 words). 3 words contain a doubled letter.

Full list 14

arbitrageurseinsteiniumssubstructureuncataloguedclostridiumsflittermousemisattributesplatterpunkcountercoupspositroniumsprestructureproctodaeumssomatopleurestratocumuli

About this list

Words
14 (3 common words)
Common example
arbitrageurs
Rare example
stratocumuli
Doubled letters
3
Ending in S
6
Most frequent letter
S (13)

Questions

How many 12-letter words matching ____t____u__ are there?

14. 3 of them are common words.

What is a common example?

ARBITRAGEURS is among the common words in this set.