Solitary rhymes with:
military, nonmilitary, paramilitary, cemetery, cometary, dietary, dignitary, hereditary, interplanetary, military, monetary, nonmilitary, paramilitary, pituitary, planetary, proprietary, salutary, secretary, tributary, unsanitary
Solitary sounds like:
salter, saltier, saltwater, salutary, saulter, schilder, schlater, schlatter, schleeter, schlitter, schlotter, schlueter, schluter, schowalter, schulder, shelter, shoulder, showalter, skelter, slater, slather, slatter, slattery, slayter, sleator, sleeter, slider, sliter, slither, slothower, sluder, sluiter, sluyter, slyter, solder, soldier, solitaire, solodar, soltero, sultry, swelter, sweltry