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Noun obstruction has 5 senses
obstruction, obstructor, obstructer, impediment, impedimenta - any structure that makes progress difficult--1 is a kind of structure, construction
 --1 has particulars:
 |  | bar; barrier; blockade; blockage, block, closure, occlusion, stop, stoppage; hindrance, hitch, preventive, preventative, encumbrance, incumbrance, interference; obstacle; tumbler | 
obstruction, blockage - the state or condition of being obstructed--2 is a kind of physiological state, physiological condition
 --2 has particulars: intestinal obstruction, ileus; tamponade, tamponage
 
obstacle, obstruction - something immaterial that stands in the way and must be circumvented or surmounted; "lack of immagination is an obstacle to one's advancement"; "the poverty of a district is an obstacle to good education"; "the filibuster was a major obstruction to the success of their plan"--3 is a kind of hindrance, deterrent, impediment, balk, baulk, check, handicap
 --3 has particulars:
obstruction - the act of obstructing; "obstruction of justice"--4 is a kind of hindrance, interference
 --4 has particulars:
obstruction - getting in someone's way--5 is a kind of maneuver, manoeuvre, play
 --5 has particulars: blocking, block, interference; check
 
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