15-Letter Words Matching ____I_______O__

There are 20 15-letter words that match ____I_______O__. 6 are common words, such as MULTIPLICATIONS and MULTIPROCESSORS. A rarer one is SPECIALISATIONS. In this set, S is the most frequent open letter (18 words). 5 words contain a doubled letter.

Full list 20

multiplicationsmultiprocessorspredispositionssophisticationsspecializationstrivializationscaprifoliaceouschoriocarcinomainitializationspassifloraceoustergiversationschorioallantoicchorioallantoisfictionizationsmissionizationsnondisjunctionsnonsimultaneousphysiopathologyrepristinationsspecialisations

About this list

Words
20 (6 common words)
Common example
multiplications
Rare example
specialisations
Doubled letters
5
Ending in S
17
Most frequent letter
S (18)

Questions

How many 15-letter words matching ____i_______o__ are there?

20. 6 of them are common words.

What is a common example?

MULTIPLICATIONS is among the common words in this set.