collar vs dog collar

collar and dog collar both are nouns.

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

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

collar: a band that fits around the neck and is usually folded over
dog collar: a stiff white collar with no opening in the front; a distinctive symbol of the clergy

As nouns, collar and dog collar are synonyms defined as:

Other synonyms of collar include choker, neckband.

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

collar: a band of leather or rope that is placed around an animal's neck as a harness or to identify it
dog collar: a collar for a dog

collar (noun)	dog collar (noun)
the act of apprehending (especially apprehending a criminal)	a collar for a dog
a figurative restraint	a stiff white collar with no opening in the front; a distinctive symbol of the clergy
a band that fits around the neck and is usually folded over	necklace that fits tightly around a woman's neck
necklace that fits tightly around a woman's neck
a band of leather or rope that is placed around an animal's neck as a harness or to identify it
the stitching that forms the rim of a shoe or boot
a short ring fastened over a rod or shaft to limit, guide, or secure a machine part
anything worn or placed about the neck
(zoology) an encircling band or marking around the neck of any animal