1) A device that gives out heat can be referred to as a heater. This device is commonly used in homes and buildings to increase the temperature, especially in cold weather. Heaters come in various forms, such as electric heaters, gas heaters, and central heating systems that distribute heat throughout a building.
2) A piece of ice hanging from the roof is known as an icicle. Icicles form when dripping water from the roof freezes as it drips off the edge. This usually occurs when the air is cold enough to freeze water, and heat from the sun or the building partially melts snow or ice on the roof.
3) An indication of how hot or cold a person or thing is, is generally measured by a thermometer. This instrument gives a numerical value to the temperature of the environment or body. Thermometers can be digital or mercury-based and are essential tools in various fields, including medicine, meteorology, and culinary arts.
4) Something which happens often or all the time is described as frequent or constant. In the context of a noun, it might be termed an "occurrence" or an "event" depending on its nature. If it's a specific predictable event that occurs regularly, it might be called a "routine" or a "habit."
5) An area of water bigger than the sea is a ocean. Oceans are vast bodies of saltwater that cover approximately 71% of the Earth's surface. There are five main oceans on Earth: the Pacific, Atlantic, Indian, Southern, and Arctic Oceans. Each ocean houses diverse ecosystems and plays a crucial role in global climate regulation and the water cycle.