Rehydrate rhymes with:
dehydrate, dehydrate, dehydrate, chlorate, dehydrate, maret, perchlorate, prostrate, verret, vibrate, zarate
Rehydrate sounds like:
rathert, reiterate, reiterated, retard, retarded, retired, retort, retorted, retread, retreat, retreated, retried, rodarte, rotert, rothert, rudyard