grounds vs side yard

grounds and side yard both are nouns.

Word	Noun	Adjective	Verb	Adverb
grounds	Yes	No	No	No
side yard	Yes	No	No	No

As nouns, side yard is a hyponym of grounds; that is, side yard is a word with a more specific, narrower meaning than grounds:

Other hyponyms of grounds include backyard, dooryard, front yard, garden, playground.

grounds (noun)	side yard (noun)
the enclosed land around a house or other building	the grounds at either side of a house
your basis for belief or disbelief; knowledge on which to base belief
a justification for something existing or happening
a tract of land cleared for some special purposes (recreation or burial etc.)
dregs consisting of solid particles (especially of coffee) that form a residue