9-Letter Words Matching I_____S__

There are 34 9-letter words that match I_____S__. 16 are common words, such as ICINESSES and IDEALISMS. A rarer one is IOTACISMS. In this set, E is the most frequent open letter (28 words). 12 words contain a doubled letter.

Full list 34

Common words

icinessesidealismsidealistsillnessesimmodestyimpetusesimpiouslyimpressedimpressesincreasedincreasesincubuses
icinessesidealismsidealistsillnessesimmodestyimpetusesimpiouslyimpressedimpressesincreasedincreasesincubusesingressesinterestsintrinsicisthmusesicehousesicterusesidocrasesimpresserintumesceidealisedidealisesidiotismsidyllistsimmunisedimmunisesincorpsedincorpsesincreaserincrossedincrossesintimistsiotacisms

About this list

Words
34 (16 common words)
Common example
icinesses
Rare example
iotacisms
Doubled letters
12
Ending in S
22
Most frequent letter
E (28)

Questions

How many 9-letter words matching i_____s__ are there?

34. 16 of them are common words.

What is a common example?

ICINESSES is among the common words in this set.