cation vs diazonium

cation and diazonium both are nouns.

Word	Noun	Adjective	Verb	Adverb
cation	Yes	No	No	No
diazonium	Yes	No	No	No

As nouns, diazonium is a hyponym of cation; that is, diazonium is a word with a more specific, narrower meaning than cation:

cation: a positively charged ion
diazonium: the univalent cation R-N:N- (where R is an aromatic hydrocarbon); found in salts that are used in manufacturing azo dyes

Other hyponyms of cation include hydrogen ion.

cation (noun)	diazonium (noun)
a positively charged ion	the univalent cation R-N:N- (where R is an aromatic hydrocarbon); found in salts that are used in manufacturing azo dyes