九寸五分[kusungobu] dagger
弦楽五重奏曲[gengakugojuusoukyoku] string quintet
五つ[itsutsu] five
五つ子[itsutsugo] quintuplets
五悪[goaku] the five sins in Buddhism (murder, theft, adultery, falsehood and drink)

五音々階[goononkai] pentatonic scale
五戒[gokai] the five precepts (prohibitions against killing, theft, sexual misconduct, lying and intemperance)
五官[gokan] the five sense organs
五感[gokan] the five senses

プー太郎[puutarou] vagabond
悪太郎[akutarou] bad boy
一姫二太郎[ichihimenitarou] It's good to have a girl first and then a boy
下郎[gerou] servant
外郎[uirou] sweet rice jelly

女郎[jorou] prostitute (esp. Edo period)
女郎花[ominaeshi] golden lace (Patrinia scabiosifolia)
新郎[shinrou] bridegroom
新郎新婦[shinroushinpu] bride and groom
バカ野郎[bakayarou] idiot

鯥五郎[mutsugorou] mudskipper (Boleophthalmus pectinirostris)
川鯥[kawamutsu] dark chub (Nipponocypris temminckii)
赤鯥[akamutsu] blackthroat seaperch (Doederleinia berycoides)

油底鯥[aburasokomutsu] escolar (Lepidocybium flavobrunneum)
沼鯥[numamutsu] Nipponocypris sieboldii (species of cyprinid)
薔薇鯥[baramutsu] oilfish (Ruvettus pretiosus)