equid vs equine

equid and equine both are nouns.

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

As nouns, equid and equine are synonyms defined as:

equid and equine: hoofed mammals having slender legs and a flat coat with a narrow mane along the back of the neck

equid (noun)	equine (noun)
hoofed mammals having slender legs and a flat coat with a narrow mane along the back of the neck	hoofed mammals having slender legs and a flat coat with a narrow mane along the back of the neck

equid (adjective)	equine (adjective)
	resembling a horse
	of or belonging to the family Equidae