The phrase "more red yellow" can be replaced by various synonyms depending on the context. If referring to a color between red and yellow, the phrase can be replaced by "orange." Alternatively, if referring to a shade that contains more red than yellow, the phrase can be replaced by "reddish-yellow" or "yellowish-red." Another synonym could be "saffron," a deep yellow shade with a hint of red. In a different context, "more red yellow" could indicate a request for a greater quantity or concentration of red and yellow. In this case, synonyms could be "increased red and yellow" or "enhanced red and yellow".