grappler vs wrestler

grappler and wrestler both are nouns.

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

As nouns, grappler and wrestler are synonyms defined as:

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

Other synonyms of grappler include matman.

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