Synonyms and related words :
alertness, attentiveness, caution, circumspection, custodianship, custody, eagle eye, guard, guardedness, guardianship, invigilation, lookout, monitoring, observance, peeled eye, proctoring, prudence, qui vive, sharp eye, stewardship, surveillance, tout, vigil, wariness, watch, watch and ward, watchful eye, watchfulness, watching, weather eye