Partly rhymes with:
artley, bartley, gartley, hartley, smartly, tartly, artley, bartley, courtly, gartley, hartley, portly, shortly, smartly, swartley, tartly
Partly sounds like:
parietal, partial, partially, partlow, pirtle, portal, portela, portell, portelli, portilla, portillo, portly, prattle, proudly, purtell, purtle