Malodour and Olfactory perception

Malodour noun - A distinctive odor that is offensively unpleasant.

Olfactory perception and malodour are semantically related. In some cases you can use "Olfactory perception" instead a noun "Malodour".

Olfactory perception noun - The sensation that results when olfactory receptors in the nose are stimulated by particular chemicals in gaseous form.

Malodour and olfactory perception are semantically related. Sometimes you can replace term "Malodour" with "Olfactory perception", this terms are similar.