is a specific kind of: controversialist, disputant, eristic.

is a broader term that covers: naysayer | stonewaller.

derivation: obstructionism | block, blockade, embarrass, hinder, obstruct, stymie, stymy | baffle, bilk, cross, foil, frustrate, queer, scotch, spoil, thwart | balk, baulk, jib, resist.

is a specific kind of: construction, structure.

is a broader term that covers: bar | barrier | blockade | block, blockage, closure, occlusion, stop, stoppage | encumbrance, hinderance, hindrance, hitch, incumbrance, interference, preventative, preventive | obstacle | tumbler.

derivation: block, close up, impede, jam, obstruct, obturate, occlude.