guard dog vs pinscher

guard dog and pinscher both are nouns.

Word	Noun	Adjective	Verb	Adverb
guard dog	Yes	No	No	No
pinscher	Yes	No	No	No

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

guard dog: a dog trained to guard property
pinscher: any of three breeds of dogs whose ears and tail are usually cropped

Other hyponyms of guard dog include kuvasz, attack dog, housedog, schipperke.

guard dog (noun)	pinscher (noun)
a dog trained to guard property	any of three breeds of dogs whose ears and tail are usually cropped