HackerVoca

pensive : thoughtful, meditative, reflective
perceive : see, discern, notice, apprehend, understand
perform : execute, discharge, fulfill, accomplish, achieve
peril : risk, jeopardy, danger, hazard
period : age, era, epoch
periphery / / noun

1 [countable usually singular] the outer area or edge that surrounds a place

[+ of]: a residential area on the periphery of the city
outskirts

2 be on the periphery to be only slightly involved in a group or activity: extremists on the periphery of the animal rights movement

: edge, border, fringe, margin, rim, verge
perish : die, decay, wither, disappear, vanish
permanent : lasting, constant, perpetual, everlasting
permission : leave, permit, allowance
permit : allow, let
perpetual : everlasting, permanent, enduring, eternal, ceaseless,
infinite