herder vs goatherd

herder and goatherd both are nouns.

Word	Noun	Adjective	Verb	Adverb
herder	Yes	No	No	No
goatherd	Yes	No	No	No

As nouns, goatherd is a hyponym of herder; that is, goatherd is a word with a more specific, narrower meaning than herder:

Other hyponyms of herder include goat herder, sheepherder, sheepman, shepherd, pigman, swineherd.

herder (noun)	goatherd (noun)
someone who drives a herd	a person who tends a flock of goats