garden lettuce vs Lactuca sativa

garden lettuce and Lactuca sativa both are nouns.

Word	Noun	Adjective	Verb	Adverb
garden lettuce	Yes	No	No	No
Lactuca sativa	Yes	No	No	No

As nouns, garden lettuce and Lactuca sativa are synonyms defined as:

garden lettuce and Lactuca sativa: annual or perennial garden plant having succulent leaves used in salads; widely grown

Other synonyms of garden lettuce include common lettuce.

garden lettuce (noun)	Lactuca sativa (noun)
annual or perennial garden plant having succulent leaves used in salads; widely grown	annual or perennial garden plant having succulent leaves used in salads; widely grown