15-Letter Words Matching U________L_____

There are 13 15-letter words that match U________L_____. 2 are common words, such as UNRELIABILITIES and UNSUITABILITIES. A rarer one is UPGRADABILITIES. 5 words contain a doubled letter.

Full list 13

unreliabilitiesunsuitabilitiesunsociabilitiesultravirilitiesunalterablenessunclimbablenessundesirablenessunendurablenessunfavorablenessunknowabilitiesunpunctualitiesunworkabilitiesupgradabilities

About this list

Words
13 (2 common words)
Common example
unreliabilities
Rare example
upgradabilities
Doubled letters
5
Ending in S
13

Questions

How many 15-letter words matching u________l_____ are there?

13. 2 of them are common words.

What is a common example?

UNRELIABILITIES is among the common words in this set.