WordNet records no synonym and no antonym for federal tax lien. 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.
lien of the United States on all property of a taxpayer who fails to pay the federal government the taxes for which he or she is liable
Synonyms, antonyms and the broader and narrower relations for federal tax lien come from Princeton University’s WordNet. Full sources and licences.