cattleman vs cowman

cattleman and cowman both are nouns.

Word	Noun	Adjective	Verb	Adverb
cattleman	Yes	No	No	No
cowman	Yes	No	No	No

As nouns, cattleman and cowman are synonyms defined as:

cattleman and cowman: a male hired hand who tends cattle and performs other duties on horseback

Other synonyms of cattleman include cowboy.

cattleman (noun)	cowman (noun)
a man who raises (or tends) cattle	a male hired hand who tends cattle and performs other duties on horseback
a male hired hand who tends cattle and performs other duties on horseback