The phrase "priority of existence" refers to the idea that some things are more important than others in terms of their existence or survival. There are several synonyms for this phrase, including "survival of the fittest," "primacy of life," and "basic necessity." These phrases all indicate that life and existence are fundamental, and that we must prioritize them above other concerns if we want to thrive. Other synonyms might include "essential nature," "fundamental rights," or "core values." These terms all convey the idea that there are certain principles or needs that we must prioritize above all else if we want to live well and prosper.