malted vs milk shake

malted and milk shake both are nouns.

Word	Noun	Adjective	Verb	Adverb
malted	Yes	Yes	No	No
milk shake	Yes	No	No	No

As nouns, milk shake is a hypernym of malted; that is, milk shake is a word with a broader meaning than malted:

malted: a milkshake made with malt powder
milk shake: frothy drink of milk and flavoring and sometimes fruit or ice cream

Other hypernyms of malted include milkshake, shake.

malted (noun)	milk shake (noun)
a milkshake made with malt powder	frothy drink of milk and flavoring and sometimes fruit or ice cream

malted (adjective)	milk shake (adjective)
of grain that has been converted into malt