Yes, lug is a Scrabble word!
...and is worth 4 points in Scrabble, and 7 points in Words with Friends
lug
Verb
1. Carry with difficulty
2. Obstruct
Noun
1. Ancient Celtic god
2. A sail with four corners that is hoisted from a yard that is oblique to the mast
3. A projecting piece that is used to lift or support or turn something
4. Marine worms having a row of tufted gills along each side of the back; often used for fishing bait
What Scrabble words can I make with the letters in lug?
3 Letter Words