partsong vs madrigal

partsong and madrigal both are nouns.

Word	Noun	Adjective	Verb	Adverb
partsong	Yes	No	No	No
madrigal	Yes	No	Yes	No

As nouns, madrigal is a hyponym of partsong; that is, madrigal is a word with a more specific, narrower meaning than partsong:

partsong: a song with two or more voice parts
madrigal: an unaccompanied partsong for 2 or 3 voices; follows a strict poetic form

Other hyponyms of partsong include round, troll.

partsong (noun)	madrigal (noun)
a song with two or more voice parts	an unaccompanied partsong for 2 or 3 voices; follows a strict poetic form

partsong (verb)	madrigal (verb)
	sing madrigals