bramble bush vs bramble

bramble bush and bramble both are nouns.

Word	Noun	Adjective	Verb	Adverb
bramble bush	Yes	No	No	No
bramble	Yes	No	No	No

As nouns, bramble is a hypernym of bramble bush; that is, bramble is a word with a broader meaning than bramble bush:

bramble bush: any prickly shrub of the genus Rubus bearing edible aggregate fruits
bramble: any of various rough thorny shrubs or vines

bramble bush (noun)	bramble (noun)
any prickly shrub of the genus Rubus bearing edible aggregate fruits	any of various rough thorny shrubs or vines