lieder singer vs vocalizer

lieder singer and vocalizer both are nouns.

Word	Noun	Adjective	Verb	Adverb
lieder singer	Yes	No	No	No
vocalizer	Yes	No	No	No

As nouns, vocalizer is a hypernym of lieder singer; that is, vocalizer is a word with a broader meaning than lieder singer:

Other hypernyms of lieder singer include singer, vocaliser, vocalist.

lieder singer (noun)	vocalizer (noun)
a singer of lieder	a person who sings
	an organism that can utter vocal sounds