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All answers having "Vexes" as clue:

4 Character Answers:

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BUGS

IRES

IRKS



5 Character Answers:

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FRETS

GALLS

GNAWS

RILES

ROILS



6 Character Answers:

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ANGERS

ANNOYS

EATSAT

TEASES



7 Character Answers:

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BOTHERS

HARROWS

NETTLES

RANKLES



8 Character Answers:

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HARASSES