The term CAREFULLY STUDY can be broken down into three crossword solutions: PERUSE (6 letters), PORE (4 letters), and POREOVER (8 letters). PERUSE means to read or examine something carefully, while PORE means to study intently. POREOVER is a combination of the two words, meaning to read or examine something intently and carefully. All three words imply that one should take their time and pay close attention when studying something.