Xylomelum vs dicot genus

Xylomelum and dicot genus both are nouns.

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

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

Xylomelum: small species of Australian trees or shrubs; grown for their fruit and flowers
dicot genus: genus of flowering plants having two cotyledons (embryonic leaves) in the seed which usually appear at germination

Other hypernyms of Xylomelum include magnoliopsid genus.

Xylomelum (noun)	dicot genus (noun)
small species of Australian trees or shrubs; grown for their fruit and flowers	genus of flowering plants having two cotyledons (embryonic leaves) in the seed which usually appear at germination