12-Letter Words Matching I_________S_

There are 34 12-letter words that match I_________S_. 10 are common words, such as IDIOSYNCRASY and IMMUNOLOGIST. A rarer one is INVASIVENESS. In this set, N is the most frequent open letter (32 words). 26 words contain a doubled letter.

Full list 34

Common words

idiosyncrasyimmunologistimplicitnessimpolitenessincisivenessindebtednessindirectnessirregardlessisolationismisolationistillusivenessillusoriness
idiosyncrasyimmunologistimplicitnessimpolitenessincisivenessindebtednessindirectnessirregardlessisolationismisolationistillusivenessillusorinessimmersionismimperialnessimpropernessinactivenessincendiarisminchoatenessinfamousnessinfinitenessinflationisminflationistintrepidnessintuitionismintuitionistironicalnessignorantnessilliberalisminexpertnessinsecurenessinstructressinterdiffuseintimatenessinvasiveness

About this list

Words
34 (10 common words)
Common example
idiosyncrasy
Rare example
invasiveness
Doubled letters
26
Ending in S
22
Most frequent letter
N (32)

Questions

How many 12-letter words matching i_________s_ are there?

34. 10 of them are common words.

What is a common example?

IDIOSYNCRASY is among the common words in this set.