milker vs milcher

milker and milcher both are nouns.

Word	Noun	Adjective	Verb	Adverb
milker	Yes	No	No	No
milcher	Yes	No	No	No

As nouns, milker and milcher are synonyms defined as:

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

milker (noun)	milcher (noun)
cattle that are reared for their milk	cattle that are reared for their milk