rededication vs dedication

rededication and dedication both are nouns.

Word	Noun	Adjective	Verb	Adverb
rededication	Yes	No	No	No
dedication	Yes	No	No	No

As nouns, dedication is a hypernym of rededication; that is, dedication is a word with a broader meaning than rededication:

rededication: a new dedication
dedication: a ceremony in which something (as a building) is dedicated to some goal or purpose

rededication (noun)	dedication (noun)
a new dedication	the act of binding yourself (intellectually or emotionally) to a course of action
	complete and wholehearted fidelity
	a short message (as in a book or musical work or on a photograph) dedicating it to someone or something
	a message that makes a pledge
	a ceremony in which something (as a building) is dedicated to some goal or purpose