The word "poring" has a few synonyms, each with their own subtle nuance. "Perusing" is one option, implying a thorough and attentive examination. "Studying" suggests a more academic approach, with a focus on understanding and memorization. "Sifting" describes a methodical sorting through of information or data. "Scrutinizing" implies a critical evaluation, often with the intent of detecting flaws or weaknesses. "Examining" is a more general alternative, indicating a close analysis of something in order to gain insight or understanding. All of these words can be used interchangeably with "poring," depending on the specific context and tone of the piece.