1. Coinage: it refers to a process which can form a new word from some invented trade names or eponyms based on the name of a person or a place.

2. Borrowing: some words are originated from other languages. A special type of borrowing is described as loan-translation, which has a direct translation of the elements of a word into the borrowing language. Boyfriend? “nanpengyou”

3. Compounding: it refers to one of word formations of combining two lexemes to form a new word. (productive)

4. Blending: it refers to a process of combining parts of two lexemes to form a new word.

5. Clipping: it refers to a process which reduces a longer term to a shorter one, not involving the change of word class.

6. Hypocorism: it refers to a process of forming a new lexeme by reducing a longer term to a short form, and then -y or -ie is added to the end.? Television ??telly
   

7. Backformation: it refers to a process which reduces a longer word to a shorter one, involving the change of word class.

8. Conversion: this is a process which changes the part of speech without any deletion or addition.

9. Acronym: the initial letters of a set of expressions can be combined to a new single word.

10. Derivation: it refers to a process of forming a new lexeme by attaching an affix to an existed lexeme. It involves?the change of the part of speech.

11. Kamhmu: it is a special process of inserting some elements into an existed lexeme to form a new word.

In fact, in the course of the development of words, words are generally involved multiple word-formation processes.