The phrase "more thermic" refers to something that generates or produces more heat. Some synonyms for this phrase include "more thermal," "more heating," "more warming," and "more hot." Other possible synonyms include "more pyroclastic," "more fiery," "more incendiary," and "more scorching." These words all describe the same basic concept of something that is generating or producing a significant amount of heat or thermal energy. Depending on the context and situation, one synonym might be more appropriate than another, but they all convey the same basic idea of something that is particularly warm, hot, or capable of producing heat.