The Collaborative International Dictionary of English v.0.48:

gocart \go"cart`\, go-cart \go"-cart`\n.
   1. A framework moving on casters, designed to support
      children while learning to walk. [WordNet sense 1]

   Syn: walker, baby-walker.
        [1913 Webster + WordNet 1.5]

   2. A cart used to carry heavy items and pushed by a person;
      it may have one, two or four wheels. [WordNet sense 2]

   Syn: handcart, pushcart, cart.
        [WordNet 1.5]

   3. a small carriage in which a baby or child is pushed
      around. [WordNet sense 3]

   Syn: baby buggy, baby carriage, perambulator, pram, stroller,
        pushchair, pusher.
        [WordNet 1.5]

The Collaborative International Dictionary of English v.0.48:

baby-walker \baby-walker\ n.
   a framework on small wheels or casters designed to support
   small children while they are learning to walk, and usually
   having a fabric support that permits the child to sit. Called
   also walker and go-cart.

   Syn: walker, go-cart
        [WordNet 1.5 +PJC]

WordNet (r) 3.0 (2006):

go-cart
    n 1: an enclosing framework on casters or wheels; helps babies
         learn to walk [syn: walker, baby-walker, go-cart]
    2: wheeled vehicle that can be pushed by a person; may have one
       or two or four wheels; "he used a handcart to carry the rocks
       away"; "their pushcart was piled high with groceries" [syn:
       handcart, pushcart, cart, go-cart]
    3: a small vehicle with four wheels in which a baby or child is
       pushed around [syn: baby buggy, baby carriage,
       carriage, perambulator, pram, stroller, go-cart,
       pushchair, pusher]