ROSTRUM is a playable word

rostrum Scrabble® Dictionary

noun
pl. rostrums or rostra
a beaklike process or part
79 Playable Words can be made from "ROSTRUM"
   2-Letter Words (10 found)
   3-Letter Words (23 found)
   5-Letter Words (13 found)
   6-Letter Words (2 found)
   7-Letter Words (1 found)