The term 'last word' can refer to a variety of things, including the final word in a conversation, a decisive statement, or the ultimate authority on a subject. The following crossword solutions all relate to this concept in some way. BYE (3 letters) is a casual way of saying GOODBYE, END (3 letters) is the conclusion of something, FAD (3 letters) is a trend that quickly fades away, AMEN (4 letters) is a religious expression of agreement, CHIC (4 letters) is a fashionable style, ADIEU (5 letters) is a more formal way of saying GOODBYE, FINIS (5 letters) is Latin for 'the END', OMEGA (5 letters) is the last letter of the Greek alphabet, SAYSO (5 letters) is an authoritative statement, MODERN (6 letters) is a contemporary style, EPITOME (7 letters) is a perfect EXAMPLE, EXAMPLE (7 letters) is a model to be followed, GOODBYE (7 letters) is another way of saying farewell, and QUINTESSENCE (12 letters) is the purest form of something.