Synonyms for Understand (same or very similar meaning)
WordNet sense 1 (be understanding of):
empathize, sympathize, empathise, sympathiseWordNet sense 2 (make sense of a language):
interpret, read, translate, readWordNet sense 3 (believe to be the case):
inferWordNet sense 4 (perceive (an idea or situation) mentally):
realize, see, realiseFrom the ODE community, based on WordNetadd/edit