sweet lemon vs sweet lime

sweet lemon and sweet lime both are nouns.

Word	Noun	Adjective	Verb	Adverb
sweet lemon	Yes	No	No	No
sweet lime	Yes	No	No	No

As nouns, sweet lemon and sweet lime are synonyms defined as:

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

Other synonyms of sweet lemon include Citrus limetta.

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