VIPER is a playable word

viper Scrabble® Dictionary

noun
pl. vipers
a venomous snake
(adjective) viperine, viperish, viperous
19 Playable Words can be made from "VIPER"
   2-Letter Words (4 found)
   3-Letter Words (8 found)
   4-Letter Words (6 found)
   5-Letter Words (1 found)