ordinance vs age limit

ordinance and age limit both are nouns.

Word	Noun	Adjective	Verb	Adverb
ordinance	Yes	No	No	No
age limit	Yes	No	No	No

As nouns, age limit is a hyponym of ordinance; that is, age limit is a word with a more specific, narrower meaning than ordinance:

ordinance: an authoritative command
age limit: regulation establishing the maximum age for doing something or holding some position

Other hyponyms of ordinance include game law, assize, speed limit.

ordinance (noun)	age limit (noun)
the act of ordaining; the act of conferring (or receiving) holy orders	regulation establishing the maximum age for doing something or holding some position
an authoritative command
a statute enacted by a city government