pollywog or polliwog /polˈi-wog/ or pollywig or polliwig /-wig/

A tadpole (also porwiggˈle)

• universe of discourse
• universes
• universitarian
• universities
• university
• university extension
• university of the air
• univocal
• univocally
• univocals
• univoltine
• Unix
• unjaded
• unjaundiced
• unjealous
• unjoint
• unjointed
• unjointing
• unjoints
• unjoyful
• unjoyous
• unjust
• unjuster
• unjustest
• unjustifiable