Tell me <b>what</b> you want.<br/><br/>Here does <b>what </b>function as a relative pronoun, meaning <b>the thing that </b>or Tell me + <b>what</b> do you want = Tell me <b>what</b> you want as an indirect question?<br/><br/>Or both are okay and is there not much difference in meaning?<br/><br/>I hope to make my question clear and hear from you again. <br/><br/>Thank you so much.