sensation, sense datum, sense experience, sense impression - an unelaborated elementary awareness of stimulation; "a sensation of touch"

scent - an odor left in passing by which a person or animal can be traced

fragrance, scent, aroma, perfume - a distinctive odor that is pleasant

fetor, foetor, malodor, malodour, reek, stench, stink, mephitis - a distinctive odor that is offensively unpleasant

acridity - having an acrid smell