spearhead vs pike

spearhead and pike both are nouns.

Word	Noun	Adjective	Verb	Adverb
spearhead	Yes	No	Yes	No
pike	Yes	No	No	No

spearhead (noun)	pike (noun)
the head and sharpened point of a spear	any of several elongate long-snouted freshwater game and food fishes widely distributed in cooler parts of the Northern Hemisphere
the leading military unit in an attack	medieval weapon consisting of a spearhead attached to a long pole or pikestaff; superseded by the bayonet
someone who leads or initiates an activity (attack or campaign etc.)	a broad highway designed for high-speed traffic
	a sharp point (as on the end of a spear)
	highly valued northern freshwater fish with lean flesh

spearhead (verb)	pike (verb)
be the leader of