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All answers having "Holy cow!" as clue:

3 Character Answers:

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BOY

GAD

GEE

MAN

OMG

OOH

RHO

WOW



4 Character Answers:

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DAMN

EGAD

GEEZ

GOSH

JEEZ

OHMY

OHNO

YIPE

ZEBU



5 Character Answers:

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EGADS

GOLLY

MYGOD

OHMAN

SCOTT

WOWZA

YEESH

YIKES

YIPES

YOWIE

YOWZA

ZOWIE



6 Character Answers:

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CRIKEY

MYGOSH

OHGOSH

SHEESH

YOWZAH

ZOUNDS



7 Character Answers:

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OHMYGOD

OMIGOSH



8 Character Answers:

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MANALIVE

MANOHMAN

OHMYGOSH



12 Character Answers:

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GEEWILLIKERS



13 Character Answers:

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LEAPINLIZARDS