is a specific kind of: aroma, odor, odour, olfactory property, scent, smell.

is a broader term that covers: B.O., body odor, body odour.

derivation: ill-smelling, malodorous, malodourous, stinky, unpleasant-smelling | fetid, foetid, foul, foul-smelling, funky, ill-scented, noisome, smelly, stinking | rank.