Yes, swell is a Scrabble word!

Verb

1. Increase in size, magnitude, number, or intensity

2. Become filled with pride, arrogance, or anger

3. Expand abnormally

4. Come up (as of feelings and thoughts, or other ephemeral things)

5. Come up, as of a liquid

6. Cause to become swollen

Adjective

1. Very good

Noun

1. The undulating movement of the surface of the open sea

2. A rounded elevation (especially one on an ocean floor)

3. A crescendo followed by a decrescendo

4. A man who is much concerned with his dress and appearance