Turkish word for heat when related to temperature is "sıcak", when related to peppers is "acı". But "acı" can also mean bitter. You have to look at the context

Turkish word for heat when related to temperature is "sıcak", when related to peppers is "acı". But "acı" can also mean bitter. You have to look at the context to understand. However things can both be spicy and bitter. In that case it gets complicated :)