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All answers having "Good heavens!" as clue:

3 Character Answers:

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RHO



4 Character Answers:

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EGAD

GASP

GOSH

ISAY

MYMY

OHME

OHMY

OHNO



5 Character Answers:

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EGADS

OHGOD

YIKES



6 Character Answers:

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CRIKEY

MYLORD

MYOHMY

MYWORD

OHMYMY



7 Character Answers:

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BLESSME

GLORYBE

MERCYME

MYSTARS



10 Character Answers:

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GRACIOUSME