A word that has a similar meaning to another word is called a "synonym." Synonyms enrich language by providing options for expressing the same idea in different ways. For example, "happy," "joyful," and "content" can be used interchangeably to convey a similar emotional state. Utilizing synonyms allows for more varied and nuanced communication. Conversely, understanding synonyms is also crucial for vocabulary development, as it allows individuals to expand their language skills and enhance both written and verbal expressions. Ultimately, synonyms are vital tools in adding depth and clarity to language.