Alert
Part of speech: adjective
Definition: Attentive; awake; on-guard.
Part of speech: noun
Definition: An alarm. A notification.
Part of speech: verb
Definition: To give warning to.
Example sentence: It is impossible for a lover of cats to banish these alert, gentle, and discriminating friends, who give us just enough of their regard and complaisance to make us hunger for more.
Aware
Part of speech: adjective
Definition: Vigilant or on one's guard against danger or difficulty.Conscious or having knowledge of something
Example sentence: Steve Irwin did wonderful conservation work but I was uncomfortable about some of his stunts. Even if animals aren't aware that you are not treating them with respect, the viewers are.