12-Letter Words Matching _____S____U_

There are 13 12-letter words that match _____S____U_. 1 are common words, such as PREPOSTEROUS and CIRROSTRATUS. A rarer one is UNPROSPEROUS. 3 words contain a doubled letter.

Full list 13

preposterouscirrostratusnimbostratusphysostomoussuperstratumsuppositiousxiphisternumappressoriumarchesporiummicrosporousultraseriousuncensoriousunprosperous

About this list

Words
13 (1 common words)
Common example
preposterous
Rare example
unprosperous
Doubled letters
3
Ending in S
9

Questions

How many 12-letter words matching _____s____u_ are there?

13. 1 of them are common words.

What is a common example?

PREPOSTEROUS is among the common words in this set.