output vs milk yield

output and milk yield both are nouns.

Word	Noun	Adjective	Verb	Adverb
output	Yes	No	Yes	No
milk yield	Yes	No	No	No

As nouns, milk yield is a hyponym of output; that is, milk yield is a word with a more specific, narrower meaning than output:

output: the quantity of something (as a commodity) that is created (usually within a given period of time)
milk yield: the amout of milk produced by a cow.

Other hyponyms of output include pick, picking, marketable yield.

output (noun)	milk yield (noun)
production of a certain amount	the amout of milk produced by a cow.
final product; the things produced
what is produced in a given time period
signal that comes out of an electronic system
the quantity of something (as a commodity) that is created (usually within a given period of time)

output (verb)	milk yield (verb)
to create or manufacture a specific amount