What literary device is exemplified by the words 'dry' and 'arid'?

The words 'dry' and 'arid' serve as an example of synonyms, which are words that have similar meanings. Both words are used to describe a lack of moisture, particularly in the context of the environment or climate. Recognizing that they communicate a similar idea demonstrates an understanding of how language can convey the same concept using different terms, enriching vocabulary and expression. Having synonyms at one's disposal enhances the ability to articulate thoughts and descriptions, enabling more nuanced writing and communication.