A person who studies the origin of the words and its meaning is called an etymologist. Etymology is a branch of linguistics. I think all these are terms are named in English language, in every developed language there is a different term for each studies.
The wisdom of using an electric heater depends on the per kilowatt cost in your region. 1  If your heater has a 1000 watt rating and your cost of electricity is $0.15/Kwh your cost to operate for one hour would be $0.15. 2  If the element is activated 10 hours out of every 24 hours your cost per day would be $1.50.
Example: How much does it cost to operate my portable electric heater? An electric heater wattage is usually given on the unit itself, or with the literature that comes with it. Our example is 1000 watts. I use the heater an average of 45 hours during winter months (1/2 hour per day for the three winter months).