equid vs quagga

equid and quagga both are nouns.

Word	Noun	Adjective	Verb	Adverb
equid	Yes	No	No	No
quagga	Yes	No	No	No

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

equid: hoofed mammals having slender legs and a flat coat with a narrow mane along the back of the neck
quagga: mammal of South Africa that resembled a zebra; extinct since late 19th century

Other hyponyms of equid include Equus caballus, horse, ass, mule, hinny, zebra, Equus quagga.

equid (noun)	quagga (noun)
hoofed mammals having slender legs and a flat coat with a narrow mane along the back of the neck	mammal of South Africa that resembled a zebra; extinct since late 19th century