Synonyms for Warming (same or very similar meaning)
WordNet sense 1 (the process of becoming warmer; a rising temperature):
heatingWordNet sense 2 (warm weather following a freeze; snow and ice melt):
thaw, thawingWordNet sense 3 (producing the sensation of heat when applied to the body):
calefacientWordNet sense 4 (used of physical heat; having a high or higher than desirable temperature or giving off heat or feeling or causing a sensation of heat or burning):
hotFrom the ODE community, based on WordNetadd/edit