Converts a natural number in the range 0 to 19 into a word representing its ordinal number in the English language.

{{Ordinal to word/0 to 19|natural[|zeroth=zeroth]}}

natural: Required. A natural number in the range 0 to 19.

zeroth: Optional. The value to use when the number is 0. Default is "zeroth". Can be made empty or, for example, "one before the first" or "seed", as appropriate for the context.

 {{Ordinal to word/0 to 19|0|zeroth=seed}}
 {{Ordinal to word/0 to 19|5}}
 {{Ordinal to word/0 to 19|18}}
 {{Ordinal to word/0 to 19|20}}
 {{Ordinal to word/0 to 19|-1}}
 

produces:

seed 
fifth
eighteenth
{{Ordinal to word/0 to 19}}: value "20" is not a natural number in the range 0 to 19
{{Ordinal to word/0 to 19}}: value "-1" is not a natural number in the range 0 to 19