What is the difference between "scent" and "odor"?

Solution 1:

Odor has a few meanings that scent doesn't:

• a characteristic, strong quality
• esteem or reputation

Conversely, scent has a few meanings that are not covered by odor:

• the sense of smell, or figuratively the power of detection
• a trace left by an animal, or figuratively any trail that can be followed

Also, scent works as a verb, while odor doesn't.

For further details and examples, see:

• Merriam-Webster: scent and odor
• Wiktionary: scent and odor
• The Free Dictionary: scent and odor

For finding more sample sentences, I refer you to these resources.

Solution 2:

"Scent" can be positive -- there's the scent of a skunk, but there's also the scent of a pretty girl's hair, the scent of jasmine or of honey, the scent of your favorite spice -- but "odor" is neutral-to-negative. Try telling a woman that she exudes an interesting odor; let me know how that works out.

Metaphorically, "odor" means "characteristic" or "reputation". They used to say "odor of sanctity" but in keeping with the generally negative connotation of the word, that phrase has disappeared, while "odor of corruption" remains.

"Scent" as a metaphor has the association of a tracking dog. There's the "scent of mystery", the "scent of a bargain". Someone who wants attention is "giving off a scent" and someone who is in the process of solving a puzzle is "on the scent".

I remember getting off the plane in my favorite Asian country, having brought my wife to visit for the first time. I took a lungful of air -- a familiar, missed mix of cilantro and lemongrass and palm tree. It had been many years and I was happy, moved, to be back. My wife wrinkled her nose. "Smells funny here."

That's the difference between "scent" and "odor".

Solution 3:

The Merriam-Webster entry for "odor" contains:

• a. a quality of something that stimulates the olfactory organ :
  scent

• b. a sensation resulting from adequate stimulation of the olfactory organ : smell

According to that definition, an odor can be a scent or a smell.

The dictionary then gives two examples for "odor":

1. The cheese has a strong odor.

2. This deodorant prevents bad odor from occurring.

The entry for "scent" has the following examples:

1. The flower has a wonderful scent.
2. The dogs followed the fox's scent.
3. The prisoner escaped because the dogs lost his scent.

Based on the definition of "odor" and on the examples, while "scent" is always associated with a living being that produces the smell, "odor" can also be associated with other smells (e.g. as the ones produced by cheese and that the deodorant prevents in the examples above).