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All answers having "Goodbye" as clue:

4 Character Answers:

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CIAO

ROTH

TATA

VALE



5 Character Answers:

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ADIEU

ADIOS

ALOHA

CHIPS

DONAT

NORMA



6 Character Answers:

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OTOOLE

SOLONG



7 Character Answers:

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MACGRAW



8 Character Answers:

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FAREWELL

SAYONARA



10 Character Answers:

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ALIMACGRAW

PHILIPROTH



11 Character Answers:

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HAPPYTRAILS

SEEYOULATER



12 Character Answers:

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FARETHEEWELL

HAVEAGOODONE



15 Character Answers:

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FAREWELLADDRESS