obstruction

(noun) any structure that makes progress difficult. Synonyms: obstructor, obstructer, impediment, impedimenta.

(noun) the physical condition of blocking or filling a passage with an obstruction. Synonyms: blockage.

(noun) something immaterial that stands in the way and must be circumvented or surmounted. Synonyms: obstacle. Examples: "Lack of imagination 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."

(noun) the act of obstructing. Example: "Obstruction of justice."

(noun) getting in someone's way.