Word Formation Processes
Definition :
Fundamental :
Common word formation processes [1]include:
Derivation: Adding affixes to a base word to create a new word.
Compounding: Combining two or more words to form a new word.
Conversion[2]: Changing a word's part of speech without altering its form.
Blending: Merging parts of two words to create a new word.
Clipping: Shortening a word.
Borrowing: Adopting words from other languages.
Coinage[3]: Creating entirely new words, often for brand names or technological terms.

Example :
teach → teacher (Derivation).
book + shelf → bookshelf (Compounding).
email [noun] → email [verb] (Conversion).
brunch from breakfast + lunch (Blending).
advertisement → ad (Clipping).
sushi from Japanese (Borrowing).
Google (Coinage).