Final answer:
The deliberate transfer of a word from one part of speech to another is known as part-of-speech conversion. This adds flexibility and versatility to language use.
Step-by-step explanation:
The deliberate transfer of a word from one part of speech to another part of speech is known as part-of-speech conversion or word-class conversion. This occurs when a word typically used as one part of speech is used in a different grammatical role. For example, the noun 'hammer' can be converted into a verb as in 'to hammer a nail'.
Part-of-speech conversion is a common linguistic phenomenon that adds flexibility and versatility to language use. It allows for creative expression and can contribute to the richness and evolution of a language.
Code-switching, on the other hand, refers to the practice of shifting between different languages or dialects within a single conversation or text. It is not specific to part-of-speech conversion, but rather involves using different linguistic styles depending on the context and interlocutors.