obstruction

[1]	obstacle , obstructor , obstructer , barrier , bar , impediment , impedimenta , check , stumbling-block , hindrance , impediment , hurdle , hitch , snag , catch , bottleneck , limitation , constraint , restriction
[2]	checking , blockage , stopping , cessation , proscription , forbidding , forbiddance , hindering , impeding , limiting , halting , slowing
[3]	obstacle