behold

appreciate, apprehend, assimilate, catch, catch on (to), cognize, compass, comprehend, conceive, cotton (to or on to), decipher, decode, dig, discern, get, grasp, intuit, know, make, make out, perceive, recognize, register, savvy, see, seize, sense, tumble (to), twig, understand

catch, descry, discern, distinguish, espy, eye, look (at), note, notice, observe, perceive, regard, remark, see, sight, spot, spy, view, witness