fatty tissue has 2 distinct synonyms spread across 1 of its 1 sense. Each sense below keeps its own list, because a synonym belongs to a meaning and not to a word: swapping one sense's substitute into another sense's sentence is how a thesaurus makes writing worse. WordNet records no antonym for it — antonymy is a relation between word forms rather than concepts, so it is deliberately sparse.
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 body tissue containing stored fat that serves as a source of energy; it also cushions and insulates vital organs
“fatty tissue protected them from the severe cold”
Synonyms, antonyms and the broader and narrower relations for fatty tissue come from Princeton University’s WordNet. Full sources and licences.