milch cow vs dairy cow

milch cow and dairy cow both are nouns.

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

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

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

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