animal fiber vs silk

animal fiber and silk both are nouns.

Word	Noun	Adjective	Verb	Adverb
animal fiber	Yes	No	No	No
silk	Yes	No	No	No

As nouns, silk is a hyponym of animal fiber; that is, silk is a word with a more specific, narrower meaning than animal fiber:

animal fiber: fiber derived from animals
silk: animal fibers produced by silkworms and other larvae that spin cocoons and by most spiders

Other hyponyms of animal fiber include horsehair, wool.

animal fiber (noun)	silk (noun)
fiber derived from animals	a fabric made from the fine threads produced by certain insect larvae
	animal fibers produced by silkworms and other larvae that spin cocoons and by most spiders