As nouns the difference between leader and steer
is that
leader is any person that s or directs while
steer is the castrated male of cattle, especially one raised for beef production or
steer can be (informal) a suggestion about a course of action or
steer can be (obsolete) a helmsman; a pilot.
As a verb steer is
to castrate (a male calf) or
steer can be to guide the course of a vessel, vehicle, aircraft etc (by means of a device such as a rudder, paddle, or steering wheel).