matter

subject matter

talking point

count, idea, point, purpose

consideration, issue, problem

body, bulk, burden, centerpiece, core, crux, essence, fundamental, generality, gist, grist, heart, kernel, keynote, main, marrow, mass, net, nub, nubbin, nucleus, pith, pivot, purport, quick, staple, substance, sum

basis

bottom, essential, essentiality

affair, argument, debate

consideration, issue, problem

crisis, crossroad(s), crunch, emergency, exigency, flash point, head, juncture, strait, zero hour

concern, trouble, worry

care, lookout, responsibility

deadlock, halt, impasse, stalemate, standstill

corner, fix, hole, hot water, jam, pickle, pinch, predicament, scrape, spot

airmail, airpost, certified mail, registered mail, rural delivery, rural free delivery, special delivery, special handling

direct mail, junk mail, mailer

card, dispatch, epistle, letter, message, missive, note, postal card, postcard, printed matter

bundle, package, shipment

issue, question

corner, fix, hole, hot water, jam, mire, pickle, predicament, quagmire, spot

crux, Gordian knot, sticky wicket, toughie (also toughy)

catch-22, dilemma, quandary

catch, glitch, hitch, pitfall, snag

conundrum, enigma, mystery, puzzle, puzzlement, riddle

brainteaser, poser, stumper

ballpark

nearness, proximity