sheepman vs sheepherder

sheepman and sheepherder both are nouns.

Word	Noun	Adjective	Verb	Adverb
sheepman	Yes	No	No	No
sheepherder	Yes	No	No	No

As nouns, sheepman and sheepherder are synonyms defined as:

sheepman and sheepherder: a herder of sheep (on an open range); someone who keeps the sheep together in a flock

Other synonyms of sheepman include shepherd.

sheepman (noun)	sheepherder (noun)
a man who raises (or tends) sheep	a herder of sheep (on an open range); someone who keeps the sheep together in a flock
a herder of sheep (on an open range); someone who keeps the sheep together in a flock