WordNet records no synonym and no antonym for woolly adelgid. It is the only member of its synset, 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 insect that feeds on hemlocks; its egg sacs are small fuzzy white balls like artificial snow on a Christmas tree
Synonyms, antonyms and the broader and narrower relations for woolly adelgid come from Princeton University’s WordNet. Full sources and licences.