grapnel vs grappling hook

grapnel and grappling hook both are nouns.

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

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

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

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

grapnel (noun)	grappling hook (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