a barrier of objects (e.g. sacks of sand) put in front of something as a defence

blocking object

something (e.g. a gate, bar, objects) that prevents or controls progress or movement

obstruction

a high, sharp mass of rock

very large hill

the act of defending from attack

armament; protection system

a barrier made of wood or wire, used round a garden etc or to divide two areas

barrier used to enclose a piece of land

a mass of very high land going up to a peak

very large hill

a worker or group of workers at the gates of a factory etc during a strike, to try to persuade others not to go to work

post of structure

an upright length of wood or metal supporting or marking something; a job; a place where a soldier is (to be) on duty; a system of collecting, sorting and delivering letters, parcels etc

upright support

a small hill; rocky peak

very large hill

a hill or mountain with an opening (crater) through which very hot gases, ashes, liquid 'rock' (lava) etc come up from below

very large hill

an upright solid structure of stone, brick etc forming one of the sides of a building or room, or used to enclose, divide or protect something (including land)

obstruction, divider