Here's what rhymes with pregnenolone.

Consider these alternatives

estrone / testimony dehydroepiandrosterone / known sphingosine / seen oxaloacetate / state spermidine / seen methylamine / mean benzophenone / acetophenone glucuronide / side luciferin / cruciferin ribulose / close citrulline / seen maleate / faleate pseudopodia / phobia bisulfite / sulfide