If you mean “empathizing” (having empathy), some synonyms could be “sympathizing”, “relating to”, and “connecting with”.
“Sympathizing” implies feeling sorrow or pity for someone else's situation and sharing in their emotions to some degree. For example, “She sympathized with her friend's loss and offered comfort.” This is similar to empathizing in that there is an emotional connection and understanding.
“Relating to” suggests being able to identify with and understand another person's experience. For instance, “He could relate to her struggles because he had gone through similar ones.” It shows a connection based on shared experiences or feelings.
“Connecting with” implies a deep emotional bond or understanding between people. For example, “The therapist was able to connect with her patient on a deep level, showing empathy for their pain.” This synonym emphasizes the act of establishing a meaningful connection that involves empathy.