milk cow vs milch cow

milk cow and milch cow both are nouns.

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

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

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

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