Which language replaced Sumerian as a spoken language around 2000 BCE?

Around 2000 BCE, the Sumerian language was replaced as a spoken language by Semitic Akkadian (also known as Assyro-Babylonian).1

While Sumerian ceased to be a living, spoken language during this time, it continued to be used in written form for administrative, legal, and literary purposes until the end of the use of cuneiform writing, which lasted until approximately the beginning of the Christian era.1