RIVULUS is a playable word

rivulus Scrabble® Dictionary

noun
pl. rivuluses
a small tropical American fish
19 Playable Words can be made from "RIVULUS"
   2-Letter Words (4 found)
   3-Letter Words (6 found)
   4-Letter Words (6 found)
   5-Letter Words (2 found)
   7-Letter Words (1 found)