onion smut vs Urocystis cepulae

onion smut and Urocystis cepulae both are nouns.

Word	Noun	Adjective	Verb	Adverb
onion smut	Yes	No	No	No
Urocystis cepulae	Yes	No	No	No

As nouns, onion smut and Urocystis cepulae are synonyms defined as:

onion smut and Urocystis cepulae: smut fungus causing blackish blisters on scales and leaves of onions; especially destructive to seedlings

onion smut (noun)	Urocystis cepulae (noun)
smut fungus causing blackish blisters on scales and leaves of onions; especially destructive to seedlings	smut fungus causing blackish blisters on scales and leaves of onions; especially destructive to seedlings