supertax

n [U] additional tax on income, paid by those who earn a very large amount of money （对高收入者徵收的）附加所得税.

superlative, superlatively, superman, supermarket, supernatural, supernaturally, supernova, supernumerary, superphosphate, superpower, superscript, supersede, supersonic, superstar, superstition, superstitious, superstitiously, superstore, superstructure, supertanker, supervene, supervention, supervise, supervision, supervisor, supervisory, supine, supinely, supper, supper-time, suppertime, supplant, supple, supplely (also supply), supplement, supplementary, supplementary benefit, suppleness, suppliant, supplicant,