grapnel vs grappling iron

grapnel and grappling iron both are nouns.

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

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

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

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

grapnel (noun)	grappling iron (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