ranching vs roundup

ranching and roundup both are nouns.

Word	Noun	Adjective	Verb	Adverb
ranching	Yes	No	No	No
roundup	Yes	No	No	No

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

ranching: farming for the raising of livestock (particularly cattle)
roundup: the activity of gathering livestock together so that they can be counted or branded or sold

ranching (noun)	roundup (noun)
farming for the raising of livestock (particularly cattle)	the systematic gathering up of suspects by the police
	the activity of gathering livestock together so that they can be counted or branded or sold
	a summary list; as in e.g. "a news roundup"