Tent is a movable, lightweight shelter which uses thin fabric to protect people from wind and rain. It usually used as shelter during camping, hiking, and other outdoor recreational activities.
Igloo is a made from blocks of snow iced on top of each other, often in the shape of a dome. They were used in winter as temporary shelters by hunters when they were away from their regular homes.
Lighthouse is a tower with a bright light at the top, located at an important or dangerous place regarding navigation. The two main purposes of a lighthouse are to serve as a navigational aid and to warn boats of dangerous areas. It is like a traffic sign on the sea.
Flat building has many apartments in it. In an apartment building, each apartment is a separate room or set of rooms for people to live in.
A small house is often called a cottage. It is usually find in village or countryside.
A skyscraper is a very tall building, usually more than 152 meter in height. Another name that people call skyscraper is highrise. For example, taiwan has a famous skyscraper which is Taipei 101.