15-Letter Words Matching ____NG_________

There are 13 15-letter words that match ____NG_________. 3 are common words, such as GEOENGINEERINGS and INCONGRUOUSNESS. A rarer one is TRIANGULARITIES. In this set, I is the most frequent open letter (13 words). 5 words contain a doubled letter.

Full list 13

geoengineeringsincongruousnessintangibilitiesbioengineeringsbelongingnessesexsanguinationsextinguishmentslaryngectomizednonengineeringsstrongyloidosesstrongyloidosistelangiectasiastriangularities

About this list

Words
13 (3 common words)
Common example
geoengineerings
Rare example
triangularities
Doubled letters
5
Ending in S
12
Most frequent letter
I (13)

Questions

How many 15-letter words matching ____ng_________ are there?

13. 3 of them are common words.

What is a common example?

GEOENGINEERINGS is among the common words in this set.