spearhead vs shaft

spearhead and shaft both are nouns.

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

spearhead (noun)	shaft (noun)
the head and sharpened point of a spear	the hollow spine of a feather
the leading military unit in an attack	a long rod or pole (especially the handle of an implement or the body of a weapon like a spear or arrow)
someone who leads or initiates an activity (attack or campaign etc.)	a revolving rod that transmits power or motion
	a long vertical passage sunk into the earth, as for a mine or tunnel
	(architecture) upright consisting of the vertical part of a column
	a vertical passageway through a building (as for an elevator)
	a long pointed rod used as a tool or weapon
	the main (mid) section of a long bone
	obscene terms for penis
	a line that forms the length of an arrow pointer
	an aggressive remark directed at a person like a missile and intended to have a telling effect
	a column of light (as from a beacon)

spearhead (verb)	shaft (verb)
be the leader of	defeat someone through trickery or deceit
	equip with a shaft