13-Letter Words Matching _UI__________

There are 14 13-letter words that match _UI__________. 3 are common words, such as GUILELESSNESS and QUINTESSENCES. A rarer one is RUINOUSNESSES. 10 words contain a doubled letter.

Full list 14

guilelessnessquintessencessuitabilitiesquincentenaryquindecennialquinquevalentquintillionthquintuplicatequizzicalnessguiltlessnessquindecillionquinquennialsquinquenniumsruinousnesses

About this list

Words
14 (3 common words)
Common example
guilelessness
Rare example
ruinousnesses
Doubled letters
10
Ending in S
8

Questions

How many 13-letter words matching _ui__________ are there?

14. 3 of them are common words.

What is a common example?

GUILELESSNESS is among the common words in this set.