15-Letter Words Matching ________O____I_

There are 22 15-letter words that match ________O____I_. 3 are common words, such as EXPRESSIONISTIC and IMPRESSIONISTIC. A rarer one is ULTRADEMOCRATIC. In this set, T is the most frequent open letter (19 words). 3 words contain a doubled letter.

Full list 22

expressionisticimpressionisticinterscholasticancylostomiasisankylostomiasiscontortionisticexhibitionisticinterferometricperfectionisticschistosomiasistrypanosomiasisadenohypophysiscytophotometricdiffractometricencephalopathicepichlorohydrinneurohypophysisnonantagonisticnonaristocraticophthalmoscopicstrongyloidosisultrademocratic

About this list

Words
22 (3 common words)
Common example
expressionistic
Rare example
ultrademocratic
Doubled letters
3
Ending in S
7
Most frequent letter
T (19)

Questions

How many 15-letter words matching ________o____i_ are there?

22. 3 of them are common words.

What is a common example?

EXPRESSIONISTIC is among the common words in this set.