Retreating rhymes with:
mistreating, treating, greeting, mistreating, treating, beating, cheating, competing, completing, defeating, deleting, depleting, eating, fleeting, geeting, greeting, heating, keating, meeting, mistreating, overeating, repeating, seating, sheeting, smeeting, sweeting, treating, unseating, wieting
Retreating sounds like:
reiterating, retarding, retreading