express has 14 distinct synonyms spread across 8 of its 13 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 local.
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.
serve as a means for expressing something
“The painting of Mary carries motherly love”
manifest the effects of (a gene or genetic trait)
“Many of the laboratory animals express the trait”
send by rapid transport or special messenger service
“She expressed the letter to Florida”
mail that is distributed by a rapid and efficient system
public transport consisting of a fast train or bus that makes only a few scheduled stops
“he caught the express to New York”
3 of the 13 recorded senses carry no synonym, antonym or related term, so they are not shown above. Every sense, with its definition and examples, is on the full entry for express.
Synonyms, antonyms and the broader and narrower relations for express come from Princeton University’s WordNet. Full sources and licences.