noun

a set or category of things having some property or attribute in common and differentiated from others by kind, type, or quality.

it has good accommodation for a hotel of this class

category,grade,rating,classification,group,grouping,bracket,set,division,kind,sort,type,order,variety,genre,brand,species,genus,family,generation,breed,strain,denomination,stamp,ilk,kidney,style,cast,grain,mould,stripe,phylum

verb

assign or regard as belonging to a particular category.

conduct which is classed as criminal

classify,categorize,group,grade,rate,type,order,sort,codify,file,index,bracket,designate,brand,mark down,label,pigeonhole,characterize,triage

adjective

showing stylish excellence.

he’s a class player

excellent,very good,first-rate,first-class,marvellous,wonderful,magnificent,outstanding,superlative,superb,formidable,virtuoso,masterly,expert,champion,fine,consummate,skilful,adept,great,terrific,tremendous,fantastic,sensational,stellar,fabulous,fab,crack,hotshot,A1,mean,demon,awesome,magic,wicked,tip-top,top-notch,smashing,brilliant,brill,shit-hot