citron vs Citrus medica

citron and Citrus medica both are nouns.

Word	Noun	Adjective	Verb	Adverb
citron	Yes	No	No	No
Citrus medica	Yes	No	No	No

As nouns, citron and Citrus medica are synonyms defined as:

citron and Citrus medica: thorny evergreen small tree or shrub of India widely cultivated for its large lemonlike fruits that have thick warty rind

Other synonyms of citron include citron tree.

citron (noun)	Citrus medica (noun)
large lemonlike fruit with thick aromatic rind; usually preserved	thorny evergreen small tree or shrub of India widely cultivated for its large lemonlike fruits that have thick warty rind
thorny evergreen small tree or shrub of India widely cultivated for its large lemonlike fruits that have thick warty rind