Citrus limetta vs Citrus limon

Citrus limetta and Citrus limon both are nouns.

Word	Noun	Adjective	Verb	Adverb
Citrus limetta	Yes	No	No	No
Citrus limon	Yes	No	No	No

As nouns, Citrus limon is a hypernym of Citrus limetta; that is, Citrus limon is a word with a broader meaning than Citrus limetta:

Citrus limetta: lemon tree having fruit with a somewhat insipid sweetish pulp
Citrus limon: a small evergreen tree that originated in Asia but is widely cultivated for its fruit

Other hypernyms of Citrus limetta include lemon, lemon tree.

Citrus limetta (noun)	Citrus limon (noun)
lemon tree having fruit with a somewhat insipid sweetish pulp	a small evergreen tree that originated in Asia but is widely cultivated for its fruit