root has 21 distinct synonyms spread across 7 of its 15 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.
(botany) the usually underground organ that lacks buds or leaves or nodes; absorbs water and mineral salts; usually it anchors the plant to the ground
the place where something begins, where it springs into being
“the Italian beginning of the Renaissance”
a number that, when multiplied by itself some number of times, equals a given number
someone from whom you are descended (but usually more remote than a grandparent)
the embedded part of a bodily structure such as a tooth, nail, or hair
Synonyms, antonyms and the broader and narrower relations for root come from Princeton University’s WordNet. Full sources and licences.
become settled or established and stable in one's residence or life style
“He finally settled down”