grappler vs grapnel

grappler and grapnel both are nouns.

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

As nouns, grappler and grapnel are synonyms defined as:

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

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

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