WordNet records no synonym and no antonym for walk-through. 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.
a thorough explanation (usually accompanied by a demonstration) of each step in a procedure or process
“she gave me a walk-through of my new duties”
a pedestrian passageway through the ground floor of a building
Synonyms, antonyms and the broader and narrower relations for walk-through come from Princeton University’s WordNet. Full sources and licences.
a first perfunctory rehearsal of a theatrical production in which actors read their lines from the script and move as directed
the act of walking in order to view something
“the realtor took her on a walk-through of the apartment”