deadwood vs redundancy

deadwood and redundancy both are nouns.

Word	Noun	Adjective	Verb	Adverb
deadwood	Yes	No	No	No
redundancy	Yes	No	No	No

As nouns, redundancy is a hypernym of deadwood; that is, redundancy is a word with a broader meaning than deadwood:

Other hypernyms of deadwood include redundance.

deadwood (noun)	redundancy (noun)
someone or something that is unwanted and unneeded	repetition of an act needlessly
a branch or a part of a tree that is dead	the attribute of being superfluous and unneeded
	(electronics) a system design that duplicates components to provide alternatives in case one component fails
	repetition of messages to reduce the probability of errors in transmission