cattleman vs cowboy

cattleman and cowboy both are nouns.

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

As nouns, cattleman and cowboy are synonyms defined as:

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

Other synonyms of cattleman include cowman.

cattleman (noun)	cowboy (noun)
a man who raises (or tends) cattle	someone who is reckless or irresponsible (especially in driving vehicles)
a male hired hand who tends cattle and performs other duties on horseback	a performer who gives exhibitions of riding and roping and bulldogging
	a male hired hand who tends cattle and performs other duties on horseback