Title Word Index : Others5
| 50 | 1975 Arsenal F.C. Ethanol Harley-Davidson Harry Potter (film series) Tin Upsilon Andromedae Who Wants to Be a Millionaire? | 
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| 500 | Independent school (United Kingdom) The Simpsons | 
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| 5000 | Tao Te Ching | 
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| 500x | Boeing 747 | 
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| 501 | Supermarine Spitfire | 
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| 502 | Supermarine Spitfire | 
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| 509 | Supermarine Spitfire | 
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| 50th | Doctor Who Median | 
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| 50x15 | Who Wants to Be a Millionaire? | 
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| 5+1 | Channel 5 (UK) | 
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| 51 | 1976 Antimony Floppy disk | 
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| 5¼ | Floppy disk | 
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| 5¼in | Floppy disk | 
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| 52 | 1977 Tellurium | 
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| 5205 | Deinonychus | 
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| 5288 | AT&T | 
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| 53 | 1978 Iodine San Jose, California | 
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| 530 | Gliese 876 | 
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| 53310761 | Elvis Presley | 
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| 535 | Andromeda Galaxy | 
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| 54 | 1979 AK-47 Xenon | 
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| 5432 | Albertosaurus | 
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| 548 | Perfect number | 
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| 55 | 1980 55 Cancri 55 Cancri c 55 Cancri e San Jose, California | 
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| 551 | Proxima Centauri | 
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| 5546 | Gliese 876 | 
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| 56 | 1981 Andromeda Galaxy Barium Crimean War | 
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| 561 | Perfect number | 
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| 57 | 1982 Lanthanum | 
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| 58 | 1983 Cerium T-34 | 
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| 59 | 1984 Praseodymium | 
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| 5a | Ethanol | 
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| 5h | Vitamin C | 
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| 5h2o | Copper(II) sulfate | 
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| 5o | Properties of water | 
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| 5text | Channel 5 (UK) | 
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| 5th | 5th century James Monroe | 
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