Synonym (or repeat context clue): An author will use more than one word that means the same thing. For example, there may be a complex word followed by a restatement using a simpler word in the same or following sentence: Felipe is a miser. He’s always been cheap.
Antonym (or contrast context clue): The text may include a word or words that have the opposite meaning, which can reveal the meaning of an unknown term: Stella has always dressed flamboyantly. I’ve never seen her wear a dull color.
Explanation (or a definition context clue): An unknown word is explained within the sentence or in the sentence immediately after: On Friday, we visited the arboretum, a garden dedicated to the exhibition of trees and plants.
Inference Clues force the reader to use rationale or reasoning skills in order to figure out the meaning of an unknown word. Even though the word is not directly defined, the reader can logically reason out the meaning using the information provided in the context. For example, “Elephants are enormous. They are the largest land animals in the world.”
I described all of them but pick any two you want :)