Solutions ...... Khalifa (world's tallest skyscraper) has 7 entries with similar clues

• 3-letter words
• pruBoston skyscraper, with "the"
• 4-letter words
• bothBest of ... worlds
• tallLofty, as skyscrapers
• 5-letter words
• shardLondon skyscraper
• 6-letter words
• humans"War of the Worlds" side
• utopiaBest of all possible worlds
• 8-letter words
• doomsdayThe end of the worlds