survival vs holdover

survival and holdover both are nouns.

Word	Noun	Adjective	Verb	Adverb
survival	Yes	No	No	No
holdover	Yes	No	No	No

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

Other hyponyms of survival include custom, usage, usance, hangover.

survival (noun)	holdover (noun)
something that survives	something that has survived from the past
a natural process resulting in the evolution of organisms best adapted to the environment	an official who remains in office after his term
a state of surviving; remaining alive