The phrase "beginning to exist" implies the creation or origin of something that did not previously exist. There are several synonyms that can be used to describe this concept, including "emergence," "birth," "genesis," "inception," "commencement," and "onset." "Emergence" refers to the act of coming into being or becoming apparent, while "birth" specifically refers to the beginning of life. "Genesis" suggests a beginning or origin, and "inception" describes the initial stages of development. "Commencement" describes the start of a period or event, and "onset" suggests the onset of a particular condition or disease. Each of these words can be used interchangeably with "beginning to exist" to describe the creation or emergence of something new.