When it comes to synonyms for the term "study living thing," there are a plethora of options available. One could use variations including "investigate living organisms," "analyze living entities," or "examine living creatures." Other terms that could be utilized include "explore life forms," "scrutinize living beings," or "observe living organisms." In addition, the phrase "research living species" could also be used. Ultimately, the most suitable synonym will depend on the context in which the phrase is being used and the exact connotations that the speaker or writer is attempting to convey.