barricade

bar, pale, paling

block, chain, clog, crimp, deterrent, drag, embarrassment, encumbrance, handicap, hindrance, hurdle, impediment, inhibition, interference, let, obstacle, obstruction, roadblock, stop, stumbling block, trammel

fetter, hobble, manacle, shackle(s)

constraint, curb, restraint, snag

buffer, bulwark, bumper, cushion, dam, fender, pad, rampart

curtain (off), screen (off)

dike, fence, gate, hedge

bolt, lock

obstruct