age, bimester, bimillenary, bimillennium, bloom, blossom, bout, canicule, century, continuance, dark, dawn, day, daylight, daytime, decade, decennary, decennium, downtime, drought, drouth, duration, efflorescence, enlistment, epoch, era, eve, evening, festival, flower, flush, forenoon, fortnight, generation, hebdomad, heyday, hitch, honeymoon, hospitalization, hour, hours, hypermenorrhea, indiction, lactation, lease, life, lifespan, lifetime, lustrum, menorrhagia, midweek, midwinter, millenary, millennium, month, morn, morning, multistage, nap, night, nighttime, noviciate, novitiate, occupation, oligomenorrhea, overtime, past, peacetime, peak, phase, prehistory, prime, prohibition, puerperium, quadrennium, quarter, quinquennium, reign, run, school, schooltime, season, semester, sleep, stage, term, tide, time, times, tour, trimester, twelvemonth, uptime, usance, wartime, watch, week, weekend, window, year, years, youth, yr.
percoid, podgier, leporid, periods, diopter, dioptre, peridot, proteid, provide, peroxid.
Your query has returned 64 words, which include anagrams of period as well as other shorter words that can be made using the letters included in period.
The words in this list can be used in games such as Scrabble, Words with Friends, Wordscapes and other similar games.