14-Letter Words Matching ______G_N_____

There are 12 14-letter words that match ______G_N_____. 2 are common words, such as SEPTUAGENARIAN and THOROUGHNESSES. A rarer one is UNCHANGINGNESS. 5 words contain a doubled letter.

Full list 12

septuagenarianthoroughnessesimmunogeneticsultimogenituregoitrogenicityimmunogenicitymucilaginouslyoverengineeredoverorganizingteratogenicitytumorigenicityunchangingness

About this list

Words
12 (2 common words)
Common example
septuagenarian
Rare example
unchangingness
Doubled letters
5
Ending in S
3

Questions

How many 14-letter words matching ______g_n_____ are there?

12. 2 of them are common words.

What is a common example?

SEPTUAGENARIAN is among the common words in this set.