fecula vs excrement

fecula and excrement both are nouns.

Word	Noun	Adjective	Verb	Adverb
fecula	Yes	No	No	No
excrement	Yes	No	No	No

As nouns, excrement is a hypernym of fecula; that is, excrement is a word with a broader meaning than fecula:

fecula: excreta (especially of insects)
excrement: waste matter (as urine or sweat but especially feces) discharged from the body

Other hypernyms of fecula include body waste, excreta, excretion, excretory product.

fecula (noun)	excrement (noun)
excreta (especially of insects)	waste matter (as urine or sweat but especially feces) discharged from the body