Holstein-Friesian vs milcher

Holstein-Friesian and milcher both are nouns.

Word	Noun	Adjective	Verb	Adverb
Holstein-Friesian	Yes	No	No	No
milcher	Yes	No	No	No

As nouns, milcher is a hypernym of Holstein-Friesian; that is, milcher is a word with a broader meaning than Holstein-Friesian:

Other hypernyms of Holstein-Friesian include dairy cattle, dairy cow, milch cow, milk cow, milker.

Holstein-Friesian (noun)	milcher (noun)
a breed of dairy cattle from northern Holland	cattle that are reared for their milk