NOSTOCS is a playable word

nostoc Scrabble® Dictionary

noun
pl. nostocs
a freshwater alga
57 Playable Words can be made from "NOSTOCS"
   2-Letter Words (5 found)
   3-Letter Words (16 found)
   5-Letter Words (11 found)
   6-Letter Words (4 found)
   7-Letter Words (1 found)