Crossword clues for the word: THIRDWORLD The word THIRDWORLD has appeared as an answer to at least 7 crossword clues on different crossword puzzles. Crossword clues for THIRDWORLD Showing 1 to 7 of 7 results Clue(s) "Developing nations, collectively" "Underdeveloped countries, collectively" Developing countries Emergent countries The —, 1978 novel by General Sir John Hackett subtitled August 1985 Undeveloped countries Unindustrialized