matman vs grappler

matman and grappler both are nouns.

Word	Noun	Adjective	Verb	Adverb
matman	Yes	No	No	No
grappler	Yes	No	No	No

As nouns, matman and grappler are synonyms defined as:

matman and grappler: combatant who tries to throw opponent to the ground

Other synonyms of matman include wrestler.

matman (noun)	grappler (noun)
combatant who tries to throw opponent to the ground	a tool consisting of several hooks for grasping and holding; often thrown with a rope
	combatant who tries to throw opponent to the ground