15-Letter Words Matching _______I_____I_

There are 13 15-letter words that match _______I_____I_. 2 are common words, such as EXPRESSIONISTIC and IMPRESSIONISTIC. A rarer one is NONPARTISANSHIP. In this set, S is the most frequent open letter (12 words). 4 words contain a doubled letter.

Full list 13

expressionisticimpressionisticantiperistalsiscommercialisticcontortionisticexhibitionisticperfectionisticpseudepigraphicpsychodiagnosisimmunodiagnosisneuroscientificnoncarcinogenicnonpartisanship

About this list

Words
13 (2 common words)
Common example
expressionistic
Rare example
nonpartisanship
Doubled letters
4
Ending in S
3
Most frequent letter
S (12)

Questions

How many 15-letter words matching _______i_____i_ are there?

13. 2 of them are common words.

What is a common example?

EXPRESSIONISTIC is among the common words in this set.