noun
General term for a bent or curved section of something, such as a pipe, road, or body part.
パイプの湾曲部に亀裂が入った。
A crack appeared in the bend of the pipe.
noun
bight
Geographical term for a bend or curve in a coastline, river, or similar feature.
There is a small inlet at the bight of the coastline.
曲がり角 is a street corner or turning point, whereas 湾曲部 is a more general or technical term for a curved section.
Compound of 湾曲 (curvature, bending) + 部 (part, section).