Synonyms :
Synonyms Words with the same or similar meaning
Examples
fat and chubby, mad and angry,
happy and glad, hungry and famished
Antonyms :
Antonyms Words with opposite meanings
Examples
Sad and happy, silly and serious, pretty and ugly, smart and stupid.
Why the heck do we need to know these terms? :
Why the heck do we need to know these terms? It makes your writing a lot more interesting if you mix up your word choice.
You can better describe your thoughts and feelings on different subjects.