The words pea, p sound the same but have different meanings and spellings. Why do pea, p sound the same even though they are completely different words?
The answer is simple: pea, p are homophones of the English language.
Physics The symbol for momentum.
piano (musical direction)
The 16th letter of the modern English alphabet.
Any of the speech sounds represented by the letter p.
A member of the pea family.
A Eurasian climbing annual vine (Pisum sativum) cultivated in all temperate zones, having compound leaves with terminal leaflets modified into tendrils and globose, edible seeds enclosed in a green, elongated pod.
The seed of this plant, used as a vegetable.
The unopened pods of this plant.
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.