sweet lemon vs Citrus limetta

sweet lemon and Citrus limetta both are nouns.

Word	Noun	Adjective	Verb	Adverb
sweet lemon	Yes	No	No	No
Citrus limetta	Yes	No	No	No

As nouns, sweet lemon and Citrus limetta are synonyms defined as:

sweet lemon and Citrus limetta: lemon tree having fruit with a somewhat insipid sweetish pulp

Other synonyms of sweet lemon include sweet lime.

sweet lemon (noun)	Citrus limetta (noun)
lemon tree having fruit with a somewhat insipid sweetish pulp	lemon tree having fruit with a somewhat insipid sweetish pulp