Yes, smelt is a Scrabble word!

Verb

1. Extract (metals) by heating

2. Inhale the odor of; perceive by the olfactory sense

3. Emit an odor

4. Smell bad

5. Have an element suggestive (of something)

6. Become aware of not through the senses but instinctively

Noun

1. Small cold-water silvery fish; migrate between salt and fresh water

2. Small trout-like silvery marine or freshwater food fishes of cold northern waters