front yard vs grounds

front yard and grounds both are nouns.

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

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

Other hypernyms of front yard include curtilage, yard.

front yard (noun)	grounds (noun)
the yard in front of a house; between the house and the street	the enclosed land around a house or other building
	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