wool vs alpaca

wool and alpaca both are nouns.

Word	Noun	Adjective	Verb	Adverb
wool	Yes	No	No	No
alpaca	Yes	No	No	No

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

wool: fiber sheared from animals (such as sheep) and twisted into yarn for weaving
alpaca: wool of the alpaca

Other hyponyms of wool include Shetland wool, raw wool, cashmere, fleece, shoddy, vicuna, virgin wool.

wool (noun)	alpaca (noun)
outer coat of especially sheep and yaks	domesticated llama with long silky fleece; believed to be a domesticated variety of the guanaco
a fabric made from the hair of sheep	a thin glossy fabric made of the wool of the Lama pacos, or made of a rayon or cotton imitation of that wool
fiber sheared from animals (such as sheep) and twisted into yarn for weaving	wool of the alpaca