The term 'demolish completely' can be defined by the crossword solutions of RAZE (4 letters), rase (4 letters), WRECK (5 letters), RUIN (4 letters), TOTAL (5 letters), and LEVEL (5 letters). RAZE means to tear down a building or structure, while rase means to scrape or shave off. WRECK implies destruction or damage, and RUIN suggests complete destruction. TOTAL implies complete destruction, and LEVEL implies to flatten or reduce to ground LEVEL. All of these words together suggest the complete destruction of a building or structure.