Lactuca sativa vs common lettuce

Lactuca sativa and common lettuce both are nouns.

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

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

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

Other synonyms of Lactuca sativa include garden lettuce.

Lactuca sativa (noun)	common lettuce (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