14-Letter Words Matching __I_________S_

There are 19 14-letter words that match __I_________S_. 9 are common words, such as BOISTEROUSNESS and CHIVALROUSNESS. A rarer one is SPIRITLESSNESS. 10 words contain a doubled letter.

Full list 19

boisterousnesschivalrousnessepidemiologistexistentialismexistentialistneighborlinessphilanthropistutilitarianismweightlessnessblithesomenessepistemologistfriendlessnessiniquitousnessphilanthropismubiquitousnessaminopeptidaseinimitablenessoxidoreductasespiritlessness

About this list

Words
19 (9 common words)
Common example
boisterousness
Rare example
spiritlessness
Doubled letters
10
Ending in S
10

Questions

How many 14-letter words matching __i_________s_ are there?

19. 9 of them are common words.

What is a common example?

BOISTEROUSNESS is among the common words in this set.