grappler vs crampoon

grappler and crampoon both are nouns.

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

As nouns, crampoon is a hyponym of grappler; that is, crampoon is a word with a more specific, narrower meaning than grappler:

grappler: a tool consisting of several hooks for grasping and holding; often thrown with a rope
crampoon: a hinged pair of curved iron bars; used to raise heavy objects

Other hyponyms of grappler include crampon.

grappler (noun)	crampoon (noun)
a tool consisting of several hooks for grasping and holding; often thrown with a rope	an iron spike attached to the shoe to prevent slipping on ice when walking or climbing
combatant who tries to throw opponent to the ground	a hinged pair of curved iron bars; used to raise heavy objects