ISOTOPE /ˈaɪ.sə.təʊp/ ► audio Scrabble 9 Words With Friends 10 Scrabble letter values: I1S1O1T1O1P3E1 = 9 Definition noun one of two or more atoms with the same atomic number but with different numbers of neutrons. See all 88 words you can make from ISOTOPE → 7-letter words Words starting with I Words ending with E ← Unscramble different letters