Spearhead has 6 different meanings across 2 categories:
Noun · Verb
someone who leads or initiates an activity (attack or campaign etc.)
the leading military unit in an attack
the head and sharpened point of a spear
The pointed head, or end, of a spear.
be the leader of
"She spearheaded the effort to find a cure for the disease"
To drive or campaign ardently for, as an effort, project, etc.