Which of the following describes a synonym?

A synonym is defined as a word that has a similar meaning to another word. This characteristic is what distinguishes synonyms from other types of word relationships. For example, the words "happy" and "joyful" are synonyms because they convey a similar emotional state. Understanding synonyms is fundamental in enhancing vocabulary and improving language skills, allowing for more precise and varied expression in writing and speaking.

The other options represent different linguistic concepts, such as antonyms, which are words with opposite meanings, making them irrelevant in the context of synonym definition. Similarly, words that describe a process or indicate a relationship pertain to specific grammatical functions or roles in a sentence, which do not align with the concept of synonyms.