noun

written or spoken communication or debate.

the language of political discourse

discussion,conversation,talk,dialogue,communication,conference,debate,consultation,verbal exchange,parley,chat,adda,korero,confab,chit-chat,powwow,confabulation,palaver,colloquy,converse,interlocution

verb

speak or write authoritatively about a topic.

she could discourse at great length on the history of Europe

hold forth,expatiate,pontificate,talk,give a talk,give an address,give a speech,lecture,sermonize,preach,orate,write learnedly,write at length,spout,spiel,speechify,preachify,sound off,perorate,lucubrate,dissertate