Delirium rhymes with:
bacterium, miriam, myriam, aquarium, atrium, auditorium, bacterium, barium, crematorium, deuterium, disequilibrium, emporium, equilibrium, herbarium, honorarium, merriam, miriam, moratorium, myriam, mysterium, opprobrium, planetarium, tellurium, thorium, yttrium
Delirium sounds like:
delawarian, delorean, delorme, delrina