When it comes to expanding your vocabulary and expressing yourself more effectively, it's important to have a variety of synonyms at your disposal. For the term "study at supine," there are several alternatives to consider. You could say "learn while lying down," "investigate while reclining," "research in a prone position," or "analyze in a recumbent posture." Each of these options provides a slightly different shade of meaning, allowing you to choose the one that best fits your specific context and intended audience. By incorporating synonyms like these into your writing and speech, you can avoid repetition and convey your ideas with greater precision and nuance.