15-Letter Words Matching __________R_N__

There are 22 15-letter words that match __________R_N__. 7 are common words, such as ANTIPERSPIRANTS and GEOENGINEERINGS. A rarer one is VIDEOCONFERENCE. In this set, E is the most frequent open letter (22 words). 8 words contain a doubled letter.

Full list 22

antiperspirantsgeoengineeringsmicroelectronicmountaineeringsnitroglycerinesnonbelligerentsnoninterferencebioengineeringscorticosteronescountercurrentsmercaptopurinesnorepinephrinesbackscatteringsenterogastronesinterelectronicmethoxyfluranesnonbelligerencynonengineeringsorganochlorinesphotoelectronicrumormongeringsvideoconference

About this list

Words
22 (7 common words)
Common example
antiperspirants
Rare example
videoconference
Doubled letters
8
Ending in S
16
Most frequent letter
E (22)

Questions

How many 15-letter words matching __________r_n__ are there?

22. 7 of them are common words.

What is a common example?

ANTIPERSPIRANTS is among the common words in this set.