British and American differences: Prefixes and Hyphens Which of these prefixed words require hyphens in British and American English? Click on the word in the left-hand column to see the different conventions used by these two nations.     1. anti aircraft antiaircraft (closed) anti-aircraft (hyphen) 2. anti impressionism anti-imperialism (hyphen) anti-imperialism (hyphen) 3. anti American anti-American (hyphen) anti-American (hyphen) 4. non fat nonfat (closed) non-fat (hyphen) 5. non nuclear nonnuclear (closed) non-nuclear (hyphen) 6. non Christian non-Christian (hyphen) non-Christian (hyphen) 7. sub atomic subatomic (closed) subatomic (closed) 8. self confidence self-confidence (hyphen) self-confidence (hyphen) 9. semi circle semicircle (closed) semi-circle (hyphen) 10. semi independent semi-independent (hyphen) semi-independent (hyphen) 11. ultra modern ultramodern (closed) ultra-modern (hyphen) 12. ultra sonic ultrasonic (closed) ultrasonic (closed) 13. un American un-American (hyphen) un-American (hyphen) 14. counter argument counterargument (closed) counter-argument (hyphen) 15. ex wife ex-wife (hyphen) ex-wife (hyphen) 16. co worker coworker (closed) co-worker (hyphen) 17. co operate cooperate (closed) co-operate(hyphen) 18. co occur co-occur (hyphen) co-occur (hyphen) 19. pre cooked precooked (closed) pre-cooked (hyphen) 20. pre WWII pre-WWII (hyphen) pre-WWII (hyphen)

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