margarita vs cocktail

margarita and cocktail both are nouns.

Word	Noun	Adjective	Verb	Adverb
margarita	Yes	No	No	No
cocktail	Yes	No	No	No

As nouns, cocktail is a hypernym of margarita; that is, cocktail is a word with a broader meaning than margarita:

margarita: a cocktail made of tequila and triple sec with lime and lemon juice
cocktail: a short mixed drink

margarita (noun)	cocktail (noun)
a cocktail made of tequila and triple sec with lime and lemon juice	a short mixed drink
	an appetizer served as a first course at a meal