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All answers having "Yikes!" as clue:

3 Character Answers:

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ACK

EEK

GAD

OMG

OOF

RHO

ULP

WOW



4 Character Answers:

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EGAD

GASP

GEEZ

GULP

JEEZ

OHNO

OHOH

UHOH

YEOW



5 Character Answers:

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EGADS

OHWOW

WOWIE

YEESH

ZOWIE



6 Character Answers:

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DEARME

OHGOSH

OHMAMA

SHEESH



7 Character Answers:

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HOLYCOW

JEEPERS

OMIGOSH



8 Character Answers:

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HOLYMOLY



9 Character Answers:

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GOODGRAVY

HOLYSMOKE



10 Character Answers:

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GREATSCOTT



12 Character Answers:

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HOLYMACKEREL



14 Character Answers:

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HEAVENSTOBETSY

LANDSAKESALIVE



15 Character Answers:

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JEEPERSCREEPERS

UHOHIMINTROUBLE