dog collar vs clerical collar

dog collar and clerical collar both are nouns.

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

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

dog collar and clerical collar: a stiff white collar with no opening in the front; a distinctive symbol of the clergy

Other synonyms of dog collar include Roman collar.

dog collar (noun)	clerical collar (noun)
a collar for a dog	a stiff white collar with no opening in the front; a distinctive symbol of the clergy
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