This is the 2234th most frequent Japanese word.
臭み
"Unpleasant smell or taste, often referring to an off-putting odor or flavor in food."
Here, "臭み" is used to describe the unpleasant smell of the fish.
魚の臭みを取るために、生姜を加えました。
To remove the fishy smell, I added ginger.
In this case, "臭み" signifies the lack of unpleasant smell in the dish.
その料理は臭みがなく、とても美味しかったです。
That dish had no unpleasant smell and was very tasty.
Here, "臭み" is metaphorically used to express an unfavorable impression in the context of words or actions.