common laburnum vs genus Laburnum

common laburnum and genus Laburnum both are nouns.

Word	Noun	Adjective	Verb	Adverb
common laburnum	Yes	No	No	No
genus Laburnum	Yes	No	No	No

common laburnum (noun)	genus Laburnum (noun)
an ornamental shrub or tree of the genus Laburnum; often cultivated for Easter decorations	flowering shrubs or trees having bright yellow flowers; all parts of the plant are poisonous