1) Compounding
Two or more words together can make a new word, which is semantically related to the components.
Example:

fridge

Do you have a fridge?
comments: normally, one can guess the meaning of compunded words by combining the meaning of components.

2) reduplication
Verbs, adjectives and adverbs can repeat themselves to make new words, whose meanings are very similar to their original meanings
Verb

Try to taste it.
comments：Verb+Verb means try to Verb

adj/adv

You are very very beautiful.
comments：adj/adv+adj/adv means more adj/adv