Yup

Is yup a scrabble word?
No Definition of 'yup' Found - It's still good as a Scrabble word though!
Yup is worth 8 points in Scrabble, and 9 points in Words with Friends
There are 3 letters in yup: P U Y
Words that can be created with an extra letter added to yup:
1 word found using the letters in "Yup"
2 Letter Words