WordNet sense 1 (one who intrudes or pushes himself forward):

thruster

WordNet sense 2 (an unlicensed dealer in illegal drugs):

peddler, drug dealer, drug peddler, drug trafficker

WordNet sense 3 (someone who pushes):

shover

WordNet sense 4 (a sandal attached to the foot by a thong over the toes):

zori

WordNet sense 5 (a small vehicle with four wheels in which a baby or child is pushed around):

carriage, go-cart, perambulator, stroller, pram, pushchair, baby buggy, baby carriage