The words tora, torah sound the same but have different meanings and spellings. Why do tora, torah sound the same even though they are completely different words?
The answer is simple: tora, torah are homophones of the English language.
See torah.
A large antelope, Bubalis tora, of northeastern Africa, very similar to the harte beest.
Judaism The first five books of the Hebrew Scriptures. See Table at Bible.
Judaism A scroll of parchment containing the first five books of the Hebrew Scriptures, used in a synagogue during services.
Judaism The entire body of religious law and learning including both sacred literature and oral tradition.
Definitions from The Century Dictionary and Cyclopedia, from The American Heritage® Dictionary of the English Language, 4th Edition and Wordnik.
Homophones (literally "same sound") are usually defined as words that share the same pronunciation, regardless of how they are spelled.
If they are spelled the same then they are also homographs (and homonyms); if they are spelled differently then they are also heterographs (literally "different writing").