grounds vs refutation

grounds and refutation both are nouns.

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

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

grounds: your basis for belief or disbelief; knowledge on which to base belief
refutation: any evidence that helps to establish the falsity of something

Other hyponyms of grounds include probable cause, cogent evidence, proof, disproof, falsification, lead, track, trail, symptom, sign.

grounds (noun)	refutation (noun)
the enclosed land around a house or other building	the act of determining that something is false
your basis for belief or disbelief; knowledge on which to base belief	any evidence that helps to establish the falsity of something
a justification for something existing or happening	the speech act of answering an attack on your assertions
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