Yes, gunk is a Scrabble word!
...and is worth 9 points in Scrabble, and 12 points in Words with Friends
gunk
Noun
1. Any thick, viscous matter
What Scrabble words can I make with the letters in gunk?
3 Letter Words
2 Letter Words
Noun
1. Any thick, viscous matter
3 Letter Words
2 Letter Words