Which of the following words has a positive connotation: Odor, Smell, Stench, or Aroma?
The word aroma has positive connotation.
These words have different connotations.
Word smell is neutral,
Words odor and stench are nouns describing unpleasant smell so they are negative.
Aroma is a nice smell, so it has positive connotation.
Note: These words are not proper nouns, so it is not necessary to capitalize them, unless they are at the beginning of a sentence.