Odorant refers to anything that has an odor. There are several synonyms that refer to the same thing, such as fragrance, aroma, scent, perfume, and essence. These words are all used to describe smells that are typically pleasant and desirable. On the other hand, there are words that offer a negative implication of an odorant such as stench and reek. These words can refer to unpleasant or bad smells that are not wanted. Additionally, the word smell can be used as a synonym for odorant, but it is often used to describe a specific type of scent or odor, rather than any odor in general.