thirteenth

As adjectives the difference between twelveth and thirteenth

is that twelveth is twelfth while thirteenth is the ordinal form of the number thirteen.

As a noun thirteenth is

the person or thing in the thirteenth position.

As an adjective thirteenth

is the ordinal form of the number thirteen.

As a noun thirteenth

is the person or thing in the thirteenth position.

As an adverb thirteenthly is

in the thirteenth place; thirteenth in a row.