milch cow vs milcher

milch cow and milcher both are nouns.

Word	Noun	Adjective	Verb	Adverb
milch cow	Yes	No	No	No
milcher	Yes	No	No	No

As nouns, milch cow and milcher are synonyms defined as:

Other synonyms of milch cow include dairy cattle, dairy cow, milk cow, milker.

milch cow (noun)	milcher (noun)
cattle that are reared for their milk	cattle that are reared for their milk