unsnap unsour unspan unspar unspin unspun unsung unsuni unsuri unu-op uopian up-dip up-sun uparap upgang upoars uponon uponor uppada uppara upparu upping uppoor upprop uproar upsara upsoar upspin upupid uragan urandi uranga urania uranin urano- uranos uranus urapar uraria uraris urasar urdari urgand urging urgons uri-on urino- uripao urison urning urodan urodid urodon uropod urring ursari ursids ursina ursini ursins ursoid ursons uruagu uruana uruara urundi urupa urupia uruppu usadip usando usangi usausa usgaon usigni usings usinor usiris usogui usonia usraon ussana ussara ussuri usuran usurps ususau