shepherdess vs sheepherder

shepherdess and sheepherder both are nouns.

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

As nouns, sheepherder is a hypernym of shepherdess; that is, sheepherder is a word with a broader meaning than shepherdess:

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

Other hypernyms of shepherdess include sheepman, shepherd.

shepherdess (noun)	sheepherder (noun)
a woman shepherd	a herder of sheep (on an open range); someone who keeps the sheep together in a flock