excreta vs guano

excreta and guano both are nouns.

Word	Noun	Adjective	Verb	Adverb
excreta	Yes	No	No	No
guano	Yes	No	No	No

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

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

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