freeloader (n.)

• barnacle
• beat
• beggar
• bloodsucker
• bummer
• cadger
• caller
• company
• deadbeat
• deadhead
• drone
• frequenter
• guest
• habitue
• hanger-on
• leech
• mendicant
• moocher
• nonworker
• panhandler
• paper
• parasite
• spiv
• sponge
• sponger
• sucker
• visitant
• visitor
• well