Lactuca sativa longifolia vs cos lettuce

Lactuca sativa longifolia and cos lettuce both are nouns.

Word	Noun	Adjective	Verb	Adverb
Lactuca sativa longifolia	Yes	No	No	No
cos lettuce	Yes	No	No	No

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

Lactuca sativa longifolia and cos lettuce: lettuce with long dark-green spoon-shaped leaves

Other synonyms of Lactuca sativa longifolia include romaine lettuce.

Lactuca sativa longifolia (noun)	cos lettuce (noun)
lettuce with long dark-green spoon-shaped leaves	lettuce with long dark-green leaves in a loosely packed elongated head
	lettuce with long dark-green spoon-shaped leaves