harpoon vs fizgig

harpoon and fizgig both are nouns.

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

As nouns, fizgig is a hypernym of harpoon; that is, fizgig is a word with a broader meaning than harpoon:

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
fizgig: an implement with a shaft and barbed point used for catching fish

Other hypernyms of harpoon include fishgig, gig, lance, spear.

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

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