grappler vs grappling hook

grappler and grappling hook both are nouns.

Word	Noun	Adjective	Verb	Adverb
grappler	Yes	No	No	No
grappling hook	Yes	No	No	No

As nouns, grappler and grappling hook are synonyms defined as:

grappler and grappling hook: a tool consisting of several hooks for grasping and holding; often thrown with a rope

Other synonyms of grappler include grapnel, grapple, grappling iron.

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