mixed drink vs mimosa

mixed drink and mimosa both are nouns.

Word	Noun	Adjective	Verb	Adverb
mixed drink	Yes	No	No	No
mimosa	Yes	No	No	No

As nouns, mimosa is a hyponym of mixed drink; that is, mimosa is a word with a more specific, narrower meaning than mixed drink:

mixed drink (noun)	mimosa (noun)
made of two or more ingredients	a mixed drink containing champagne and orange juice
	any of various tropical shrubs or trees of the genus Mimosa having usually yellow flowers and compound leaves
	evergreen Australasian tree having white or silvery bark and young leaves and yellow flowers