Which term describes the English language's variety of words from multiple languages?

The term that best describes the English language's variety of words from multiple languages is "Creole." Creole languages typically emerge in contexts where speakers of different languages need to communicate, often leading to the blending of vocabulary and grammar from those languages. English itself has a rich history of borrowing words from many languages—such as Latin, French, Spanish, and others—resulting in a diverse lexicon that reflects its complex socio-linguistic roots.

While "melting pot" does refer to a societal concept where different cultures blend together, it does not specifically define the linguistic process of integrating words from various languages into a single language. It describes the broader sociocultural context rather than the specific linguistic phenomenon of word borrowing. Acculturation refers to the process by which individuals adopt cultural traits of another society, and synthesis denotes the combining of ideas or elements to form a coherent whole, neither of which specifically captures the notion of a language acquiring vocabulary from multiple sources.