noun
Refers to a physical object that blocks passage or hinders movement; used in contexts like traffic, construction, or barriers.
道路に妨害物があって通れなかった。
There was an obstacle on the road and we couldn't pass.
障害物 is more common and broader, covering both physical obstacles and abstract hindrances; 妨害物 is less frequent and emphasizes deliberate obstruction or interference.
Compound of 妨害 (ぼうがい, 'obstruction') + 物 (ぶつ, 'thing'). The exact historical derivation is straightforward from the kanji meanings.