grapnel vs grappler

grapnel and grappler both are nouns.

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

As nouns, grapnel and grappler are synonyms defined as:

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

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

grapnel (noun)	grappler (noun)
a light anchor for small boats	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