Spearhead

n.

1.

The pointed head, or end, of a spear.

Noun	1.	spearhead - someone who leads or initiates an activity (attack or campaign etc.)
	2.	spearhead - the leading military unit in an attack
	3.	spearhead - the head and sharpened point of a spear Synonyms: spear-point, spearpoint
Verb	1.	spearhead - be the leader of; "She spearheded the effort to find a cure for the disease"

advance guard, airhead, avant-garde, battle line, be the bellwether, beachhead, beacon, blaze the trail, break the ice, bridgehead, cutting edge, farthest outpost, first line, forefront, front, front line, front rank, front-runner, get ahead of, get before, go before, guide, have the start, head, head the line, initiate, lap, launch, lead, lead the dance, lead the way, light the way, line, outguard, outpost, outstrip, pace, pioneer, point, precede, precursor, railhead, scout, set the pace, stand first, take the initiative, take the lead, van, vanguard