The phrase "has all to oneself" means to have exclusive possession or control over something or someone. There are several synonyms for this expression, including having the run of the place, having the place to oneself, having free rein, enjoying exclusive access, and monopolizing. Similarly, other words that convey the same idea include occupying, ruling, dominating, and commandeering. These words are commonly used to describe situations where an individual or group has complete control or authority over a particular area or thing. Overall, the use of synonyms enhances the richness of language and allows for a more diverse range of expression.