Syzygium vs dicot genus

Syzygium and dicot genus both are nouns.

Word	Noun	Adjective	Verb	Adverb
Syzygium	Yes	No	No	No
dicot genus	Yes	No	No	No

As nouns, dicot genus is a hypernym of Syzygium; that is, dicot genus is a word with a broader meaning than Syzygium:

Syzygium: a tropical evergreen tree of the myrtle family native to the East Indies but cultivated elsewhere
dicot genus: genus of flowering plants having two cotyledons (embryonic leaves) in the seed which usually appear at germination

Other hypernyms of Syzygium include magnoliopsid genus.

Syzygium (noun)	dicot genus (noun)
a tropical evergreen tree of the myrtle family native to the East Indies but cultivated elsewhere	genus of flowering plants having two cotyledons (embryonic leaves) in the seed which usually appear at germination