prong collar vs dog collar

prong collar and dog collar both are nouns.

Word	Noun	Adjective	Verb	Adverb
prong collar	Yes	No	No	No
dog collar	Yes	No	No	No

As nouns, dog collar is a hypernym of prong collar; that is, dog collar is a word with a broader meaning than prong collar:

prong collar: a chain-link collar with blunted open ends turned towards the dog's neck.
dog collar: a collar for a dog

prong collar (noun)	dog collar (noun)
a chain-link collar with blunted open ends turned towards the dog's neck.	a collar for a dog
	a stiff white collar with no opening in the front; a distinctive symbol of the clergy
	necklace that fits tightly around a woman's neck