Yes, hump is a Scrabble word!
...and is worth 11 points in Scrabble, and 13 points in Words with Friends
hump
Verb
1. Round one's back by bending forward and drawing the shoulders forward
2. Have sexual intercourse with
Noun
1. Something that bulges out or is protuberant or projects from its surroundings
What Scrabble words can I make with the letters in hump?
3 Letter Words
2 Letter Words