Open English Wordnet
Nouns
(n)understanding, apprehension, discernment, savvythe cognitive condition of someone who understands“he has virtually no understanding of social cause and effect”
(n)taste, appreciation, discernment, perceptivenessdelicate discrimination (especially of esthetic values)“arrogance and lack of taste contributed to his rapid success”, “to ask at that particular time was the ultimate in bad taste”
(n)sagacity, sagaciousness, judgment, judgement, discernmentthe mental ability to understand and discriminate between relations