torch song vs song

torch song and song both are nouns.

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

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

Other hypernyms of torch song include vocal.

torch song (noun)	song (noun)
a popular song concerned with disappointment in love	the act of singing
	a short musical composition with words
	the characteristic sound produced by a bird
	a distinctive or characteristic sound
	a very small sum