TETRAHEDRON /tɛtɹəˈhiːdɹən/ Scrabble 15 Words With Friends 15 Scrabble letter values: T1E1T1R1A1H4E1D2R1O1N1 = 15 Definition noun any polyhedron having four plane faces. See all 507 words you can make from TETRAHEDRON → 11-letter words Words starting with T Words ending with N ← Unscramble different letters