Antonyms are the words that have opposite meaning.
Synonyms are the words that have similar meaning.
One Word Substitutions
One word substitutions are defined as single words that are used in place of a group of words to denote a person, an object, a place etc.
Idioms and Phrases
The expression that have a different meaning from its literal meaning.
The words that pronounce the same, but have different meanings are called homophones.