red mulberry vs mulberry

red mulberry and mulberry both are nouns.

Word	Noun	Adjective	Verb	Adverb
red mulberry	Yes	No	No	No
mulberry	Yes	No	No	No

As nouns, mulberry is a hypernym of red mulberry; that is, mulberry is a word with a broader meaning than red mulberry:

red mulberry: North American mulberry having dark purple edible fruit
mulberry: any of several trees of the genus Morus having edible fruit that resembles the blackberry

Other hypernyms of red mulberry include mulberry tree.

red mulberry (noun)	mulberry (noun)
North American mulberry having dark purple edible fruit	sweet usually dark purple blackberry-like fruit of any of several mulberry trees of the genus Morus
	any of several trees of the genus Morus having edible fruit that resembles the blackberry