THESAURUS
Perceive
appreciate, apprehend, ascertain, be acquainted with, be apprised of, be aware of, be cognizant of, be conscious of, be conversant with, be informed, be sensible of, behold, believe, catch on, catch sight of, clap eyes on, cognize, come alive, comprehend, conceive, conceptualize, conclude, consider, contemplate, decipher, deduce, deem, descry, detect, determine, dig, discern, discover, distinguish, divine, espy, experience, fathom, feel, feel deeply, figure out, gather, glimpse, grasp, have, have a sensation, have in sight, have information about, have knowledge of, hear, identify, infer, judge, ken, know, lay eyes on, look on, look upon, make out, mark, mind, note, notice, observe, penetrate, pick out, pick up, pierce, plumb, possess, prehend, realize, receive an impression, recognize, regard, remark, respond, respond to stimuli, savvy, see, see daylight, see into, see the light, see through, seize, sense, sight, signal, smell, spot, spy, take, take in, taste, think, touch, twig, understand, view, witness, wot, wot of
ROGET THESAURUS
Perceive
Physical Sensibility
VB
be sensible of, feel, perceive, render sensible, sharpen, cultivate, tutor, cause sensation, impress, excite an impression, produce an impression.
Vision
VB
see, behold, discern, perceive, have in sight, descry, sight, make out, discover, distinguish, recognize, spy, espy, ken, get a sight of, have a sight of, catch a sight of, get a glimpse of, have a glimpse of, catch a glimpse of, command a view of, witness, contemplate, speculate, cast the eyes on, set the eyes on, be a spectator of, look on, see sights, see at a glance, look, view, eye, lift up the eyes, open one's eye, look at, look on, look upon, look over, look about one, look round, survey, scan, inspect, run the eye over, run the eye through, reconnoiter, glance round, glance on, glance over turn one's looks upon, bend one's looks upon, direct the eyes to, turn the eyes on, cast a glance, observe, watch, see with one's own eyes, watch for, peep, peer, pry, take a peep, play at bopeep, look full in the face, look hard at, look intently, strain one's eyes, fix the eyes upon, rivet the eyes upon, stare, gaze, pore over, gloat on, leer, ogle, glare, goggle, cock the eye, squint, gloat, look askance.
Knowledge
VB
know, ken, scan, wot, wot aware, be aware of, ween, weet, trow, have, possess, conceive, apprehend, comprehend, take, realize, understand, savvy, appreciate, fathom, make out, recognize, discern, perceive, see, get a sight-of, experience, know full well, have some knowledge of, possess some knowledge of, be au courant, have in one's head, have at one' fingers ends, know by heart, know by rote, be master of, connaitre le dessous des cartes, know what's what, see one's way, discover, come to one's knowledge.