spear vs impale

spear is a noun but impale is not a noun.

Word	Noun	Adjective	Verb	Adverb
spear	Yes	No	Yes	No
impale	No	No	Yes	No

As verbs, impale is a hypernym of spear; that is, impale is a word with a broader meaning than spear:

Other hypernyms of spear include empale, spike, transfix.

spear (noun)	impale (noun)
a long pointed rod used as a tool or weapon
an implement with a shaft and barbed point used for catching fish

spear (verb)	impale (verb)
pierce with a spear	pierce with a sharp stake or point
thrust up like a spear	kill by piercing with a spear or sharp pole