Answer: ALERTER

Possible questions:


Tornado siren, e.g. we know 2 Answers
Paul Revere, for one we know 6 Answers
Siren, for one we know 3 Answers
More watchful we know 1 Answer
More attentive we know 1 Answer
Revere, once we know 1 Answer
One warning we know 1 Answer
More vigilant we know 1 Answer
More observant we know 1 Answer
Less sleepy we know 1 Answer

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