top out has 2 distinct synonyms spread across 2 of its 3 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 bottom out.
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.
give up one's career just as one becomes very successful
“The financial consultant topped out at age 40 because he was burned out”
to reach the highest point; attain maximum intensity, activity
“That wild, speculative spirit peaked in 1929”
Synonyms, antonyms and the broader and narrower relations for top out come from Princeton University’s WordNet. Full sources and licences.