grope has 1 distinct synonym spread across 1 of its 4 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.
search blindly or uncertainly
“His mind groped to make the connection”
Synonyms, antonyms and the broader and narrower relations for grope come from Princeton University’s WordNet. Full sources and licences.
fondle for sexual pleasure
“He made some sexual advances at the woman in his office and groped her repeatedly”
the act of groping; and instance of groping