IPA: /əbˈstrʌktər/
KK: /əbˈstrʌktər/
A person or thing that blocks or hinders progress or movement.
The fallen tree was an obstructor on the road, making it difficult for cars to pass.
Obstructor → It is formed from "ob-" (meaning against) and "struere" (meaning to build). The word "obstructor" refers to someone or something that builds against or hinders progress.
Think of someone who is 'building against' ('ob-') something, which is why an obstructor is someone who hinders or blocks progress.