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All answers having "Welcome!" as clue:

3 Character Answers:

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AVE

MAT



4 Character Answers:

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HAIL

MEET



5 Character Answers:

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ENTER

GREET

HELLO

HEROS

PANTS

SAYSO

SEEIN

YOURE



6 Character Answers:

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ABOARD

ACCEPT



7 Character Answers:

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EMBRACE

RECEIVE

USHERIN



8 Character Answers:

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COMEONIN

GLADHAND

GRATEFUL

GREETING



9 Character Answers:

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GREETINGS



10 Character Answers:

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TRANSITION



11 Character Answers:

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RESPECTABLE