question, problem on homework etc. / a question; a matter (of time etc.) / a problem (something that needs to be dealt with); a trouble / an issue; a matter

count / number

(archaic) substitution / (archaic) price, cost, charge / (historical) shiro, a unit of land

world, society / (archaic) age, generation, era of rule

generation of a royal family / era, age, decade

charge, fare, rate, fee, price, rent / (indicating years spanning a specific period) -ies, -hundreds

substitute / alternate / representative / generation

regular costumer; patron

everything

(colloquial) current boyfriend