The term "more surrogate" can be used to describe something that acts as a substitute or replacement for something else. Synonyms for this phrase include "further substitute", "additional proxy", "extra stand-in", "supplementary replacement", "auxiliary surrogate", and "extended alternate". Each of these synonyms provides a slightly different shade of meaning, but all convey the idea of something that takes the place of something else. Whether you are writing about parenting, medicine, or any number of other topics, these synonyms can help you add variety and precision to your language.