grounds vs justification

grounds and justification both are nouns.

Word	Noun	Adjective	Verb	Adverb
grounds	Yes	No	No	No
justification	Yes	No	No	No

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

grounds (noun)	justification (noun)
the enclosed land around a house or other building	the act of defending or explaining or making excuses for by reasoning
your basis for belief or disbelief; knowledge on which to base belief	something (such as a fact or circumstance) that shows an action to be reasonable or necessary
a justification for something existing or happening	a statement in explanation of some action or belief
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