progress has 18 distinct synonyms spread across 6 of its 6 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 regress.
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.
gradual improvement or growth or development
“advancement of knowledge”
the act of moving forward (as toward a goal)
a movement forward
“he listened for the progress of the troops”
Synonyms, antonyms and the broader and narrower relations for progress come from Princeton University’s WordNet. Full sources and licences.