pinscher vs guard dog

pinscher and guard dog both are nouns.

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

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

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

Other hypernyms of pinscher include watchdog.

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