pusher

Short definition from Wiktionary

Noun

1. 1
   Someone or something that pushes.
2. 2
   A person employed to push passengers onto trains at busy times, so they can depart on schedule.
3. 3
   A girl or woman.
4. 4
   A drug dealer.
5. 5
   An aircraft with the propeller behind the fuselage.
6. 6
   A device that one pushes in order to transport a baby while on foot, such as a stroller or pram (as opposed to a carrier such as a front or back pack).
7. 7
   A defensive player who does not attempt to hit winners, instead playing slower shots into the opponent's court.
8. 8
   A tolkach.
9. 9
   Synonym of banker (“type of railway locomotive”).
10. 10
    A device in a coke oven for levelling the coal, traditionally operated by a pusherman.