Acronymyالتلفظ بالحروف الأولى من مجموعة كلمات
It is the process whereby a word is formed from the initials of agroup of words
e.g NATO(North Atlantic Treaty Organization
RV(Recreational Vehicle


Antonomasiaتكوين كلمات من أسماء لأماكن أو أشخاص معينين
It means the formation of acommon noun or a verb from the name of a person or place
e.g Alover may be called a romeo or a don juan or a casanova
If someone Is not practical enough he may meat his waterloo
You may have heard of the verb Americanize


Inventionالإبتكار
Now and then new words are totally invented and find their way into the common vocabulary
e.g kodak nylon kleenex

source An Introductory English Grammar by Norman C.Stageberg