The words inductance, inductants sound the same but have different meanings and spellings. Why do inductance, inductants sound the same even though they are completely different words?
The answer is simple: inductance, inductants are homophones of the English language.
The property of an electric circuit by which an electromotive force is induced in it as the result of a changing magnetic flux.
A circuit element, typically a conducting coil, in which electromotive force is generated by electromagnetic induction.
Definitions 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").