Among the currently most popular synonyms for observe are: remember, celebrate, detect, clock, reconnoiter, declare, study, look at, discern, interject, stand by, make out, distinguish, scrutinize, see, inspect, behold, twig, eye, espy, monitor, memorialize, utter, mark, eyeball, keep tabs on, say, get a load of, keep an eye on, pronounce, remark, comment, witness, view, opine, solemnize, commemorate, mention, perceive, spot, survey, case, announce, check out, contemplate, interpose, notice, discover, watch, descry, fulfill, state, examine.