carbon group element vs crystallogen

carbon group element and crystallogen both are nouns.

Word	Noun	Adjective	Verb	Adverb
carbon group element	Yes	No	No	No
crystallogen	Yes	No	No	No

As nouns, carbon group element and crystallogen are synonyms defined as:

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

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

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