Immensities are vast and expansive areas or quantities that are difficult to comprehend. However, there are several synonyms for the word "immensities" in English. Some of the synonyms include words like enormity, infinity, enormity, bigness, magnitude, vastness, spaciousness, hugeness, and extensive. These synonyms can be used in different contexts to convey a sense of grandeur, scale, and magnitude. For instance, one could refer to the immensity of the universe or the enormity of a particular crime. In summary, the various synonyms for immensities offer a diverse range of options that can be used to describe vast and expansive things in different contexts.