"spearheads" in the noun sense
1. spearhead
someone who leads or initiates an activity (attack or campaign etc.)
2. spearhead
the leading military unit in an attack
3. spearhead, spearpoint, spear-point
the head and sharpened point of a spear
"spearheads" in the verb sense
1. spearhead
be the leader of
"She spearheaded the effort to find a cure for the disease"
Source: WordNet® (An amazing lexical database of English)
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