electronic mail(Information or computer stored messages that are transmitted or exchanged from one computer terminal to another, through telecommunication)
tide(The periodic rise and fall of the water resulting from gravitational interaction between the sun, moon and earth. In each lunar day of 24 hours and 49 minutes there are two high tides and two low tides)
echinoderm(Marine coelomate animals distinguished from all others by an internal skeleton composed of calcite plates, and a water-vascular system to serve the needs of locomotion, respiration, nutrition or perception)