pentadactylism
pentadecagon
pentagon
pentagonal
pentagonally
pentagraf
pentagram
pentagynous
pentahedral
pentahedron
pentahydrate
pentamerism
pentamerous
pentameter
pentandrous
pentane
pentangle
pentangular
pentapetalous
pentaphyllous
pentaploid
pentaprism
pentaspherical
pentastyle
pentasyllable
pentateuch
pentathlete
pentathlon
pentatomic
pentavalence