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perceive

verb, to become aware of (something) through the senses, esp the sight; recognize or observe

percussive

adjective, of, caused by, or relating to percussion

periscope

noun, any of a number of optical instruments that enable the user to view objects that are not in the direct line of vision, such as one in a submarine for looking above the surface of the water. They have a system of mirrors or prisms to reflect the light and often contain focusing lenses

perk up

verb, to make or become more cheerful, hopeful, or lively

persuasive

adjective, having the power or ability to persuade; tending to persuade