grappling iron vs grappler

grappling iron and grappler both are nouns.

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

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

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

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

grappling iron (noun)	grappler (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