Coinage: the invention of new words.
The invention and general use of totally new terms, or coinage, is not very common in English.
Typical sources are trade names for commercial products that become general terms (usually without capital letters) for any version of that product.
Ex: aspirin, nylon, vaseline, zipper, granola, kleenex, teflon and xerox.
It may be that there is an obscure technical origin (e.g. te (tra)-fl(uor)-on) for some of these invented terms, but after their first coinage, they tend to become everyday words in the language.
Eponym: a word derived from the name of a person or place.
New words based on the name of a person or a place are called eponyms.
When we talked about a hoover (or even a spangler), we were using an eponym.
We use the eponyms teddy bear, derived from US president Theodore (Teddy) Roosevelt, and jeans (from the talian city of Genoa where the type of cloth was first made).
Acronyms are new words formed from the initial letters of a set of other words. These can be forms such as CD (“compact disk”) or SPCA (“Society for the Prevention of Cruelty to Animals”).
More typically, acronyms are pronounced as new single words, as in NATO, NASA or UNESCO.