Pinyin: fu4 gu3 Definition: to return to old ways (a Confucian aspiration)/to turn back the clock/neoclassical school during Tang and Song associated with classical writing 古文/retro (fashion style based on nostalgia, esp. for 1960s)
Pinyin: gu3 wen2 Definition: old language/the Classics/classical Chinese as a literary model, esp. in Tang and Song prose/classical Chinese as a school subject
Pinyin: gu3 qin2 Definition: guqin, a long zither with 5 or 7 strings, plucked with a plectrum/the ancestor of the long zither family, dating back to pre-classical times (playing it was an essential accomplishment of a Confucian gentleman)
Pinyin: Cha2 ma3 gu3 dao4 Definition: old tea-horse road or southern Silk Road, dating back to 6th century, from Tibet and Sichuan through Yunnan and Southeast Asia, reaching to Bhutan, Sikkim, India and beyond
Decomposition Levels: Level 1: Only divided once. So only two components. Level 2: Radical Decomposition. The character gets decomposed into its lowest radical components. For the complete list visit the Radical wikipedia page. Level 3: Graphical Decomposition. Shows all the strokes & lowest level of components that make up the character. If you see questions marks or too many "block" characters, especially when it comes to level 3 decomposition you might need the correct font.