ACTINIUM /ækˈtɪniəm/ Scrabble 12 Words With Friends 16 Scrabble letter values: A1C3T1I1N1I1U1M3 = 12 Definition noun a radioactive element of the actinide series. — synonyms: Ac, atomic_number_89 Examples “found in uranium ores” See all 88 words you can make from ACTINIUM → 8-letter words Words starting with A Words ending with M ← Unscramble different letters