false witness(n = noun.person) perjurer - a person who deliberately gives false testimony;
is a kind of liar, prevaricator

N  deceiver &c (deceive), dissembler, hypocrite, sophist, Pharisee, Jesuit, Mawworm, Pecksniff, Joseph Surface, Tartufe, Janus, serpent, snake in the grass, cockatrice, Judas, wolf in sheep's clothing, jilt, shuffler, stool pigeon, liar &c (lie), story-teller, perjurer, false witness, menteur a triple etage, Scapin, bunko steerer, carpetbagger, capper, faker, fraud, four flusher, horse coper, ringer, spieler, straw bidder, imposter, pretender, soi-disant, humbug, adventurer, Cagliostro, Fernam Mendez Pinto, ass in lion's skin, actor, quack, charlatan, mountebank, saltimbanco, saltimbanque, empiric, quacksalver, medicaster, Rosicrucian, gypsy, man of straw, conjuror, juggler, trickster, prestidigitator, jockey, crimp, decoy, decoy duck, rogue, knave, cheat, swindler, jobber, saint abroad and a devil at home.

adverse witness, bear witness, bear witness against, bearing false witness, blue false indigo, california false morel, character witness, expert witness, false, false alarm, false alumroot, false asphodel, false azalea, false baby's breath, false beachdrops, false belief, false bittersweet, false bracken, false buckthorn, false bugbane, false calyx, false chamomile, false deathcap, false dogwood, false dragon head, false dragonhead, false face, false foxglove, false front, false fruit, false garlic, false gavial, false glottis, false goatsbeard, false gromwell, false hair, false heather, false hellebore, false imprisonment, false indigo, false labor, false lily of the valley, false lupine, false mallow, false mildew, false mistletoe, false miterwort, false mitrewort, false modesty, false morel, false move, false name, false nettle, false oat, false pimpernel, false pregnancy, false pretence, false pretense, false ragweed, false return, false rue, false rue anemone, false saber-toothed tiger, false saffron, false sago, false sarsaparilla, false scorpion, false show, false smut, false step, false tamarisk, false teeth, false topaz, false truffle, false vampire, false vampire bat, false verdict, false vocal cord, false vocal fold, false wintergreen, hostile witness, jehovah's witness, lay witness, material witness, play false, red false mallow, saddled-shaped false morel, scentless false camomile, sweet false chamomile, white false indigo, witness, witness box, witness stand