WordNet records no synonym and no antonym for pockmark. 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 scar or pit on the skin that is left by a pustule of smallpox or acne or other eruptive disease
mark with or as if with pockmarks
“Her face was pockmarked by the disease”
Synonyms, antonyms and the broader and narrower relations for pockmark come from Princeton University’s WordNet. Full sources and licences.