15-Letter Words Matching ______I___R____

There are 14 15-letter words that match ______I___R____. 3 are common words, such as DISEQUILIBRIUMS and GEOENGINEERINGS. A rarer one is TRANSHISTORICAL. 4 words contain a doubled letter.

Full list 14

disequilibriumsgeoengineeringsmountaineeringsbioengineeringsisoperimetricaldisequilibrateddisequilibratesethnohistoriansethnohistoricalnonengineeringsnonequilibriumsprotohistorianssociohistoricaltranshistorical

About this list

Words
14 (3 common words)
Common example
disequilibriums
Rare example
transhistorical
Doubled letters
4
Ending in S
9

Questions

How many 15-letter words matching ______i___r____ are there?

14. 3 of them are common words.

What is a common example?

DISEQUILIBRIUMS is among the common words in this set.