Question

Which phrase has a more negative connotation?
a stench
an odor

Answer 1

a stench

Step-by-step explanation:

A stench implies a REALLY offensive smell, whereas an odor is a more generic / neutral smell.

Answer 2

Answer: Stench but it is depends on the context.

Explanation: Stench implies a smell that is foul while odor can be used to describe any kind of smell (i.e. pleasant odor).