hibiscus vs mallow

hibiscus and mallow both are nouns.

Word	Noun	Adjective	Verb	Adverb
hibiscus	Yes	No	No	No
mallow	Yes	No	No	No

As nouns, mallow is a hypernym of hibiscus; that is, mallow is a word with a broader meaning than hibiscus:

hibiscus (noun)	mallow (noun)
any plant of the genus Hibiscus	any of various plants of the family Malvaceae