crystallogen vs tetragen

crystallogen and tetragen both are nouns.

Word	Noun	Adjective	Verb	Adverb
crystallogen	Yes	No	No	No
tetragen	Yes	No	No	No

As nouns, crystallogen and tetragen are synonyms defined as:

crystallogen and tetragen: any chemical element that belongs to the carbon group.

Other synonyms of crystallogen include carbon group element, Group 14 element, tetrel.

crystallogen (noun)	tetragen (noun)
any chemical element that belongs to the carbon group.	any chemical element that belongs to the carbon group.