rejuvenate has 2 distinct synonyms spread across 1 of its 5 senses. Each sense below keeps its own list, because a synonym belongs to a meaning and not to a word: swapping one sense's substitute into another sense's sentence is how a thesaurus makes writing worse. Its one recorded opposite is age.
Counts are distinct word forms across every sense. A synonym that appears under three senses is counted once here and shown three times below, under each sense it belongs to.
cause (a stream or river) to erode, as by an uplift of the land
develop youthful topographical features
“the land rejuvenated”
make younger or more youthful
“The contact with his grandchildren rejuvenated him”
Synonyms, antonyms and the broader and narrower relations for rejuvenate come from Princeton University’s WordNet. Full sources and licences.
return to life; get or give new life or energy
“The week at the spa restored me”
become young again
“The old man rejuvenated when he became a grandfather”