greening vs rejuvenation

greening and rejuvenation both are nouns.

Word	Noun	Adjective	Verb	Adverb
greening	Yes	No	No	No
rejuvenation	Yes	No	No	No

As nouns, greening and rejuvenation are synonyms defined as:

greening and rejuvenation: the phenomenon of vitality and freshness being restored

greening (noun)	rejuvenation (noun)
the phenomenon of vitality and freshness being restored	the act of restoring to a more youthful condition
	the phenomenon of vitality and freshness being restored