poison bush vs darling pea

poison bush and darling pea both are nouns.

Word	Noun	Adjective	Verb	Adverb
poison bush	Yes	No	No	No
darling pea	Yes	No	No	No

As nouns, poison bush and darling pea are synonyms defined as:

poison bush and darling pea: either of two Australian plants of the genus Swainsona that are poisonous to sheep

poison bush (noun)	darling pea (noun)
either of two Australian plants of the genus Swainsona that are poisonous to sheep	either of two Australian plants of the genus Swainsona that are poisonous to sheep
any of various Australian evergreen shrubs of the genus Gastrolobium having whorled compound leaves poisonous to livestock and showy yellow to deep reddish-orange flowers followed by two-seeded pods