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All answers having "Furthermore..." as clue:

3 Character Answers:

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AND

ANO

RHO

TOO

YET



4 Character Answers:

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ALSO

PLUS



5 Character Answers:

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AGAIN



6 Character Answers:

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ATTHAT

INFACT



7 Character Answers:

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ANDALSO

BASHFUL

BESIDES



8 Character Answers:

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MOREOVER



10 Character Answers:

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INADDITION



12 Character Answers:

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ADDITIONALLY



14 Character Answers:

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BYTHESAMETOKEN