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.
For a simple example, let's say that electricity costs you 10 cents per kilowatt hour. If you run a 1500 watt heater on high for one hour, you would use 1.5 kilowatt hours, and it would cost you 15 cents. This means it would cost you $3.60/day or $108/month if you ran it on high for 24 hours a day.