Yoko = side. Keri (geri) = kick. (Ke)age = to rise, rising. Yoko geri keage = rising side kick, side snap kick. "Rising" comes from the pendulum-like upward motion. Yoko = side. Keri (geri) = kick. (Ke)komi = to stomp. Yoko geri kekomi = stomping (thrusting) side kick, side thrust kick. "Stomp" comes from the straightforward stomping fashion the kick is performed. "Yoko geri" with no specification may mean any kick performed to the side. Practically it usually means either yoko geri kekomi (more often) or yoko geri keage. Striking area is most often sokuto (soku = foot, to = edge, sword, "foot blade", side of the heel), and occasionally the kick is called as sokuto geri.