wormcast vs excrement

wormcast and excrement both are nouns.

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

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

wormcast: cylindrical mass of earth voided by a burrowing earthworm or lugworm
excrement: waste matter (as urine or sweat but especially feces) discharged from the body

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

wormcast (noun)	excrement (noun)
fossil trail of a worm	waste matter (as urine or sweat but especially feces) discharged from the body
cylindrical mass of earth voided by a burrowing earthworm or lugworm