body waste vs guano

body waste and guano both are nouns.

Word	Noun	Adjective	Verb	Adverb
body waste	Yes	No	No	No
guano	Yes	No	No	No

As nouns, guano is a hyponym of body waste; that is, guano is a word with a more specific, narrower meaning than body waste:

body waste: waste matter (as urine or sweat but especially feces) discharged from the body
guano: the excrement of sea birds; used as fertilizer

body waste (noun)	guano (noun)
waste matter (as urine or sweat but especially feces) discharged from the body	the excrement of sea birds; used as fertilizer