afterdamp, aroma, aura, blackdamp, breath, chokedamp, cloud, coal gas, damp, definite odor, detectable odor, ectoplasm, ectoplasy, emanation, essence, exhalation, exhaust, exhaust gas, exteriorized protoplasm, fetid air, firedamp, flatus, flavor, fluid, fragrance, fume, malaria, mephitis, miasma, odor, puff of smoke, redolence, reek, savor, scent, smell, smoke, smudge, spoor, steam, stench, subtle odor, trace, trail, vapor, volatile, water vapor, whiff