fizgig vs harpoon

fizgig and harpoon both are nouns.

Word	Noun	Adjective	Verb	Adverb
fizgig	Yes	No	No	No
harpoon	Yes	No	Yes	No

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

fizgig: an implement with a shaft and barbed point used for catching fish
harpoon: a spear with a shaft and barbed point for throwing; used for catching large fish or whales; a strong line is attached to it

Other hyponyms of fizgig include leister.

fizgig (noun)	harpoon (noun)
a firework that fizzes as it moves	a spear with a shaft and barbed point for throwing; used for catching large fish or whales; a strong line is attached to it
an implement with a shaft and barbed point used for catching fish

fizgig (verb)	harpoon (verb)
	spear with a harpoon