herder vs goat herder

herder and goat herder both are nouns.

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

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

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

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