what is the difference between star alliance and dreamliner Or Boeing?

Star Alliance is a network of various airlines, such as United and Lufthansa
Boeing is an airplane manufacturer.
Dreamliner is another name for the 787, one of Boeing's planes.

Other than all having to do with aviation, they're completely different things.

Star Alliance is a global airline alliance that includes United Airlines, Air Canada, Lufthansa Airlines, Swiss, Austrian and LOT, Air China, Singapore Airlines, Air New Zealand and about 60 more full member and affiliate airlines.

Dreamliner is a trade name for a Boeing 787, a medium size wide-body passenger jet. 787 is assembled in Everett, WA and in North Charleston, SC. It comes in three models, the 787-8, 787-9, and 787-10 that vary by the fuselage length, the number of passengers they carry and how far they can fly. All 787-10s will be assembled in North Charleston.

Major components for the 787 are built in Japan, North Charleston and Wichita, KS. To deliver these components to the assembly sites Atlas Air, under contract to Boeing, operates a fleet of specially modified 747-400BCF cargo planes capable of carrying oversize loads. These planes are called Dreamlifters.

Boeing in an American aerospace company with headquarters in Chicago. It builds passenger and military aircraft, including Boeing 737, 747, 767, 787, F-15 and F/A-18, satellites and spacecraft, space launch vehicles, and weapon systems.