Fourth
Part of speech: adjective
Definition: The ordinal form of the number four.
Part of speech: noun
Definition: (not used in the plural) The person or thing in the fourth position. A quarter, one of four equal parts of a whole. (not used in the plural) The fourth gear of an engine.
Example sentence: The inflated imitations of gold and silver, which after the rapture are thrown into the fire, all is exhausted and dissipated by the debt. All scrips and bonds are wiped out. At the fourth pillar dedicated to Saturn, split by earthquake and flood: vexing everyone, an urn of gold is found and then restored.
Ordinal
Part of speech: adjective
Definition: Of a number, indicating position in a sequence.
Part of speech: noun
Definition: An ordinal number such as first, second and third.