German shepherd dog vs German police dog

German shepherd dog and German police dog both are nouns.

Word	Noun	Adjective	Verb	Adverb
German shepherd dog	Yes	No	No	No
German police dog	Yes	No	No	No

As nouns, German shepherd dog and German police dog are synonyms defined as:

German shepherd dog and German police dog: breed of large shepherd dogs used in police work and as a guide for the blind

Other synonyms of German shepherd dog include alsatian, German shepherd.

German shepherd dog (noun)	German police dog (noun)
breed of large shepherd dogs used in police work and as a guide for the blind	breed of large shepherd dogs used in police work and as a guide for the blind