WordNet records no synonym and no antonym for moonwalk. 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 kind of dance step in which the dancer seems to be sliding on the spot
“Michael Jackson perfected the moonwalk in the 1980s”
an exploratory walk by an astronaut on the surface of the moon
Synonyms, antonyms and the broader and narrower relations for moonwalk come from Princeton University’s WordNet. Full sources and licences.