1. impediment, impedimenta, obstructer, obstruction, obstructor

any structure that makes progress difficult

• impediment
• impedimenta
• obstructer
• obstructor

2. blockage, obstruction

the physical condition of blocking or filling a passage with an obstruction

• blockage

3. obstacle, obstruction

something immaterial that stands in the way and must be circumvented or surmounted

Example Sentences:
'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'

• obstacle

4. obstruction

the act of obstructing

Example Sentences:
'obstruction of justice'

5. obstruction

getting in someone's way