The words pseud, sued sound the same but have different meanings and spellings. Why do pseud, sued sound the same even though they are completely different words?
The answer is simple: pseud, sued are homophones of the English language.
An intellectually pretentious person; a poseur
Law To petition (a court) for redress of grievances or recovery of a right.
Law To institute proceedings against (a person) for redress of grievances.
Law To carry (an action) through to a final decision.
To court; woo.
Definitions from Wiktionary, Creative Commons Attribution/Share-Alike License, 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.