The term 'one of a kind' is used to describe something that is UNIQUE and cannot be replicated. The crossword solutions for this term include TOKEN (5 letters), SOLE (4 letters), INIMITABLE (10 letters), ONLY (4 letters), UNIQUE (6 letters), NONPAREIL (9 letters), ORIGINAL (8 letters), LULU (4 letters), UNIT (4 letters), LONER (5 letters), nonsuch (8 letters), and raaavis (8 letters). All of these words are synonyms for the phrase 'one of a kind' and emphasize the idea of something being singular and incomparable.