nonsense word
unlike a sememe, may have no definition; if it can be pronounced according to a language's phonotactics, it is a pseudoword; used in literature for poetic or humorous effect. Proper names of real or fictional entities are sometimes nonsense words
en-US/ˈnɑnsɛns ˈwɝd/
en-GB/ˈnɒnsəns ˈwɜːd/