grappler vs grappling iron

grappler and grappling iron both are nouns.

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

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

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

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

grappler (noun)	grappling iron (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