pentamerism
pentamerous
pentameter
pentandrous
pentane
pentangle
pentangular
pentapetalous
pentaphyllous
pentaploid
pentaprism
pentaspherical
pentastyle
pentasyllable
pentateuch
pentathlete
pentathlon
pentatomic
pentavalence
pentavalent
pentecost
pentecostal
penthouse
pentice
pentimenti
pentimento
pentium
pentode
pentomic
pentose