Meanings

hutong (narrow street or alley in a traditional residential area of a Chinese city, esp. Beijing)

same plane

coplanar

same mother

advocate

same father

line synchronization

different in appearance but essentially the same in content

other companies in the same business

sibling

same sort

as good as new

sympatry

permanent magnet synchronous motor

fan club

video game produced by hobbyists

software created by hobbyists (esp. video games)

isobar

isobar

concentric