Hypernyms (cordial is a kind of...): alcohol; alcoholic beverage; inebriant; intoxicant (a liquor or brew containing alcohol as the active agent) Hyponyms (each of the following is a kind of cordial): absinth; absinthe (strong green liqueur flavored with wormwood and anise) ratafee; ratafia (sweet liqueur made from wine and brandy flavored with plum or peach or apricot kernels and bitter almonds)
Bourbon is mostly made from corn, at least 51% corn. Rye whiskey is mostly or entirely made from Rye. They differ in many other details - for example Bourbon must be aged in new, charred American Oak barrels and made in the US, Scotch must be made in Scotland, but the big differences are the grains used.
The only legal difference between bourbon and rye products is their mash bill, or grain content: Bourbon must be fermented from a mash that is a majority of corn, and rye from a majority of rye. Otherwise, the legal and stylistic requirements for the two products are identical.