ONOMASTICS /ˌɒ.nəʊˈmæs.tɪks/ ► audio Scrabble 14 Words With Friends 17 Definition noun the branch of lexicology that studies the forms and origins of proper names. See all 389 words you can make from ONOMASTICS → 10-letter words Words starting with O Words ending with S ← Unscramble different letters