Underly rhymes with:
underlie, underlie, underlie, underlie, alai, apply, belie, bely, bligh, bly, blye, comply, fly, flye, imply, july, lai, lie, ly, lye, mcfly, misapply, overfly, oversupply, ply, rely, reply, resupply, sligh, sly, slye, supply, underlie
Underly sounds like:
underhill, underlie, unnatural, unnaturally