pero
but
per
through, by means of
+
however
but, nevertheless
Pero means but and can be remembered by thinking of the English prefix per-0 (through0) followed by a sound similar to 'oh'. It functions like the English word however1.
conjunction
  1. but
    But, yet, or however
    Quiero ir, pero no puedo. // I want to go, but I can't.