stock farmer vs cow man

stock farmer and cow man both are nouns.

Word	Noun	Adjective	Verb	Adverb
stock farmer	Yes	No	No	No
cow man	Yes	No	No	No

As nouns, cow man is a hyponym of stock farmer; that is, cow man is a word with a more specific, narrower meaning than stock farmer:

Other hyponyms of stock farmer include breeder, stock breeder, beef man, cattleman, sheepman.

stock farmer (noun)	cow man (noun)
farmer who breed or raises livestock	a man who raises (or tends) cattle