bumblebee vs bee

bumblebee and bee both are nouns.

Word	Noun	Adjective	Verb	Adverb
bumblebee	Yes	No	No	No
bee	Yes	No	No	No

As nouns, bee is a hypernym of bumblebee; that is, bee is a word with a broader meaning than bumblebee:

bumblebee: robust hairy social bee of temperate regions
bee: any of numerous hairy-bodied insects including social and solitary species

bumblebee (noun)	bee (noun)
robust hairy social bee of temperate regions	any of numerous hairy-bodied insects including social and solitary species
	a social gathering to carry out some communal task or to hold competitions