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All answers having "Greetings" as clue:

3 Character Answers:

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AVE

HIS

RHO



4 Character Answers:

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AVES

FROM



5 Character Answers:

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ALOHA

HELLO



6 Character Answers:

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ALOHAS

HELLOS

HIYALL

SMILES



7 Character Answers:

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HIHEMAN

HITHERE

HOWDIES



10 Character Answers:

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HELLOTHERE



11 Character Answers:

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HOWDOYOUDOS

KONNICHIWAG

SALUTATIONS