Periscope rhymes with:
polariscope, gastroscope, gyroscope, horoscope, microscope, polariscope, gastroscope, gyroscope, horoscope, kaleidoscope, microscope, ophthalmoscope, oscilloscope, polariscope, stethoscope, telescope
Periscope sounds like:
perceive, percussive, persuasive, precip, preoccupy, presby, procopio, prokofiev, prokop