The term 'igloo shapes' refers to the dome-shaped structures made of snow and ice that are used by the Inuit people as temporary shelters. The crossword solution for this term is 'DOMES, ' which is a five-letter word. DOMES are a type of architectural structure that is typically round or oval in shape and has a curved roof. They are often used as a roof for a building, but can also be used as a shelter. In the case of igloos, the DOMES are made of snow and ice blocks that are stacked together to form a shelter.