15-Letter Words Matching __________I__S_

There are 22 15-letter words that match __________I__S_. 4 are common words, such as BLAMEWORTHINESS and HYPERTHYROIDISM. A rarer one is SUPERPARASITISM. In this set, T is the most frequent open letter (20 words). 14 words contain a doubled letter.

Full list 22

blameworthinesshyperthyroidisminvoluntarinesstrustworthinessecclesiasticismextemporarinesshermaphroditismhydrodynamicistperfunctorinessunseaworthinessantiromanticismbloodguiltinesscrashworthinessfragmentarinessgentlemanlinesshousewifelinesshyperinsulinismhyperparasitismpersnicketinesspsychophysicistrudimentarinesssuperparasitism

About this list

Words
22 (4 common words)
Common example
blameworthiness
Rare example
superparasitism
Doubled letters
14
Ending in S
13
Most frequent letter
T (20)

Questions

How many 15-letter words matching __________i__s_ are there?

22. 4 of them are common words.

What is a common example?

BLAMEWORTHINESS is among the common words in this set.