rassling vs sumo

rassling and sumo both are nouns.

Word	Noun	Adjective	Verb	Adverb
rassling	Yes	No	No	No
sumo	Yes	No	No	No

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

rassling: the sport of hand-to-hand struggle between unarmed contestants who try to throw each other down
sumo: a Japanese form of wrestling; you lose if you are forced out of a small ring or if any part of your body (other than your feet) touches the ground

rassling (noun)	sumo (noun)
the sport of hand-to-hand struggle between unarmed contestants who try to throw each other down	a Japanese form of wrestling; you lose if you are forced out of a small ring or if any part of your body (other than your feet) touches the ground