serenade vs song

serenade and song both are nouns.

Word	Noun	Adjective	Verb	Adverb
serenade	Yes	No	Yes	No
song	Yes	No	No	No

As nouns, song is a hypernym of serenade; that is, song is a word with a broader meaning than serenade:

Other hypernyms of serenade include vocal.

serenade (noun)	song (noun)
a song characteristically played outside the house of a woman	the act of singing
a musical composition in several movements; has no fixed form	a short musical composition with words
	the characteristic sound produced by a bird
	a distinctive or characteristic sound
	a very small sum

serenade (verb)	song (verb)
sing and play for somebody