achieving — to bring to a successful end; carry through; accomplish: The police crackdown on speeders achieved its purpose.
believing — to have confidence in the truth, the existence, or the reliability of something, although without absolute proof that one is right in doing so: Only if one believes in something can one act purposefully.
perceiving — to become aware of, know, or identify by means of the senses: I perceived an object looming through the mist.
receiving — to take into one's possession (something offered or delivered): to receive many gifts.
relieving — to ease or alleviate (pain, distress, anxiety, need, etc.).
retrieving — to recover or regain: to retrieve the stray ball.
Four-or-more syllable rhymes
disbelieving — to have no belief in; refuse or reject belief in: to disbelieve reports of UFO sightings.