song vs bargain

song and bargain both are nouns.

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

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

Other hypernyms of song include buy, steal.

song (noun)	bargain (noun)
the act of singing	an agreement between parties (usually arrived at after discussion) fixing obligations of each
a short musical composition with words	an advantageous purchase
the characteristic sound produced by a bird
a distinctive or characteristic sound
a very small sum

song (verb)	bargain (verb)
	come to terms; arrive at an agreement
	negotiate the terms of an exchange