newness vs recency

newness and recency both are nouns.

Word	Noun	Adjective	Verb	Adverb
newness	Yes	No	No	No
recency	Yes	No	No	No

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

Other hyponyms of newness include brand-newness, freshness, recentness, revolutionariness.

newness (noun)	recency (noun)
the quality of being new; the opposite of oldness	a time immediately before the present
	the property of having happened or appeared not long ago