growth has 9 distinct synonyms spread across 3 of its 7 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. WordNet records no antonym for it — antonymy is a relation between word forms rather than concepts, so it is deliberately sparse.
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.
(biology) the process of an individual organism growing organically; a purely biological unfolding of events involved in an organism changing gradually from a simple to a more complex level
“he proposed an indicator of osseous development in children”
a progression from simpler to more complex forms
“the growth of culture”
a process of becoming larger or longer or more numerous or more important
“the increase in unemployment”
vegetation that has grown
“a growth of trees”
Synonyms, antonyms and the broader and narrower relations for growth come from Princeton University’s WordNet. Full sources and licences.