redundancy vs deadwood

redundancy and deadwood both are nouns.

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

As nouns, deadwood is a hyponym of redundancy; that is, deadwood is a word with a more specific, narrower meaning than redundancy:

Other hyponyms of redundancy include fifth wheel.

redundancy (noun)	deadwood (noun)
repetition of an act needlessly	someone or something that is unwanted and unneeded
the attribute of being superfluous and unneeded	a branch or a part of a tree that is dead
(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