sweet pea vs Lathyrus odoratus

sweet pea and Lathyrus odoratus both are nouns.

Word	Noun	Adjective	Verb	Adverb
sweet pea	Yes	No	No	No
Lathyrus odoratus	Yes	No	No	No

As nouns, sweet pea and Lathyrus odoratus are synonyms defined as:

sweet pea and Lathyrus odoratus: climbing garden plant having fragrant pastel-colored flowers

Other synonyms of sweet pea include sweetpea.

sweet pea (noun)	Lathyrus odoratus (noun)
climbing garden plant having fragrant pastel-colored flowers	climbing garden plant having fragrant pastel-colored flowers