A synonym is a word that has almost the same meaning as another word.
When a word has several synonyms, use the one that works best in the sentence.
There are many classroom jobs to do.
There are many classroom tasks to do.
"Have you finished the chapter?"
"Have you completed the chapter?"
That is a very big tree.
That is a very large tree.
An antonym is a word that means the opposite of another word.
When a word has more than one antonym, use the one that expresses your meaning exactly.
The turtle has a hard shell.
antonym of hard: soft
Joshua was feeling bored at home.
antonym of bored: excited
It was a very long road to get home.
antonym of long: