Hello! Good afternoon. to notice: is generally used when discovering something, is used when you are unaware of something "I was eating my ice cream when I noticed there was a bug in it". "You were walking across the street when we noticed a car coming" To be aware of: when you generally know of something "I am aware that i'm tall" (i know that i'm tall) "April is alcohol awareness month" (being informed/knowing the dangers of alcohol) "Are you aware of the dangers with this job"? (do you generally know of the dangers of this job) to perceive (has two very similar definitions): 1.to interpret in one's own way 2.to come to understand/to become aware "I have my own perception of what life is about" (1) "The truth is rarely perceived." (2) To realize: to fully understand, to have no questions about (similar to understand) "I realize the pursuit of peace is not as dramatic as the pursuit of war". (i understand the pursuit...) "we realize the extent of the gulf between us" (we understand the extent of...) Hope this helps!