Subsoil rhymes with:
topsoil, airfoil, fermoyle, gargoyle, hispanoil, hydrofoil, parboil, pennzoil, topsoil, turmoil
Subsoil sounds like:
savagely, sheepishly, spacial, spackle, speagle, special, speciale, specially, speckle, speegle, spegal, speziale, spiegel, spogli, spousal, suspiciously