The term 'Subject of Study' can be broken down into two crossword solutions: AREA (4 letters) and OLOGY (5 letters). AREA refers to a particular field or branch of knowledge, while OLOGY is a suffix that denotes the study of a particular subject. Together, they form the phrase 'Subject of Study, ' which is used to refer to an academic discipline or field of study. This could include anything from mathematics to history to psychology.