genus Zigadenus vs Zigadenus

genus Zigadenus and Zigadenus both are nouns.

Word	Noun	Adjective	Verb	Adverb
genus Zigadenus	Yes	No	No	No
Zigadenus	Yes	No	No	No

As nouns, genus Zigadenus and Zigadenus are synonyms defined as:

genus Zigadenus and Zigadenus: genus of mostly North American poisonous plants; sometimes placed in family Melanthiaceae

genus Zigadenus (noun)	Zigadenus (noun)
genus of mostly North American poisonous plants; sometimes placed in family Melanthiaceae	genus of mostly North American poisonous plants; sometimes placed in family Melanthiaceae