genus Cercis vs Judas tree

genus Cercis and Judas tree both are nouns.

Word	Noun	Adjective	Verb	Adverb
genus Cercis	Yes	No	No	No
Judas tree	Yes	No	No	No

genus Cercis (noun)	Judas tree (noun)
deciduous shrubs and trees of eastern Asia, southern Europe and the United States	small tree of the eastern Mediterranean having abundant purplish-red flowers growing on old wood directly from stems and appearing before the leaves: widely cultivated in mild regions; wood valuable for veneers