WordNet records no synonym and no antonym for escalade. It is the only member of each of its synsets, which is common for technical, taxonomic and single-sense vocabulary — there is no other English word that means the same thing. The broader and narrower terms below are the useful relations in that case.
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.
an act of scaling by the use of ladders (especially the walls of a fortification)
climb up and over
“They had to escalade canyons to reach their destination”
Synonyms, antonyms and the broader and narrower relations for escalade come from Princeton University’s WordNet. Full sources and licences.