hub vs municipal center

hub and municipal center both are nouns.

Word	Noun	Adjective	Verb	Adverb
hub	Yes	No	No	No
municipal center	Yes	No	No	No

As nouns, municipal center is a hyponym of hub; that is, municipal center is a word with a more specific, narrower meaning than hub:

hub: a center of activity or interest or commerce or transportation; a focal point around which events revolve
municipal center: the center of a city

Other hyponyms of hub include civic center, down town.

hub (noun)	municipal center (noun)
the central part of a car wheel (or fan or propeller etc) through which the shaft or axle passes	the center of a city
a center of activity or interest or commerce or transportation; a focal point around which events revolve