Odor (noun)

1. A distinctive smell, especially an unpleasant one.
2. A quality or atmosphere suggestive of something, especially something undesirable.

Origin:

From middle english, from anglo-french odur, from latin odor.

Examples:

1. The odor of the garbage was overwhelming.
2. The odor of the flowers in the garden was lovely.
3. The odor of the perfume was too strong for her.
4. There was an odor of decay and neglect about the old house.
5. The odor of fear was palpable in the room.