barnyard vs yard

barnyard and yard both are nouns.

Word	Noun	Adjective	Verb	Adverb
barnyard	Yes	No	No	No
yard	Yes	No	No	No

As nouns, yard is a hypernym of barnyard; that is, yard is a word with a broader meaning than barnyard:

barnyard (noun)	yard (noun)
a yard adjoining a barn	an enclosure for animals (as chicken or livestock)
	a long horizontal spar tapered at the end and used to support and spread a square sail or lateen
	the enclosed land around a house or other building
	an area having a network of railway tracks and sidings for storage and maintenance of cars and engines
	a tract of land enclosed for particular activities (sometimes paved and usually associated with buildings)
	a tract of land where logs are accumulated
	a unit of length equal to 3 feet; defined as 91.44 centimeters; originally taken to be the average length of a stride
	a unit of volume (as for sand or gravel)
	the cardinal number that is the product of 10 and 100