speak vs speak up

Other hyponyms of speak include read, phonate, vocalise, vocalize, troll, begin, lip off, shoot one's mouth off, shout, whisper, peep, snap, snarl, enthuse, speak in tongues, swallow, verbalise, verbalize, whiff, talk about, talk of, blubber, blubber out, drone, drone on, bumble, falter, stammer, stutter, rasp, blunder, blunder out, blurt, blurt out, ejaculate, inflect, modulate, tone, deliver, present, generalise, generalize, blab, blabber, chatter, clack, gabble, gibber, maunder, palaver, piffle, prate, prattle, tattle, tittle-tattle, twaddle, chatter, jaw, rattle on, yack, yack away, yap away, open up, snivel, whine, murmur, maunder, mumble, mussitate, mutter, slur, bark, bay, jabber, mouth off, rabbit on, rant, rave, spout, hiss, sibilate, siss, sizz, cackle, babble, chant, intone, tone, gulp, sing, talmbout.