Sound alike but spelled differently and have different meanings:
* See/Sea: One is the act of perceiving with your eyes, the other is a large body of saltwater.
* See/Sea/C: "See" and "Sea" are homophones, but "C" is a letter of the alphabet, not a word.
* So/Sow: "So" is used to express agreement or consequence, while "sow" means to plant seeds.
* Son/Sun: One is a male child, the other is a star.
* Some/Sum: "Some" refers to an indefinite quantity, while "sum" is the total of numbers added together.
* Stair/Stare: "Stair" is a step in a staircase, while "stare" is to look intently.
* Steel/Steal: "Steel" is a strong metal alloy, while "steal" means to take something without permission.
* Straight/Strait: "Straight" means in a direct line, while "strait" refers to a narrow passage of water.
* Than/Then: "Than" is used for comparison, while "then" refers to time.
* Their/There/They're: "Their" is possessive, "there" indicates a location, and "they're" is a contraction of "they are."
* To/Too/Two: "To" indicates direction, "too" means excessively, and "two" is the number 2.
* Through/Thru: "Through" means passing from one side to the other, "thru" is a slangy abbreviation.
* Threw/Through: "Threw" is the past tense of "throw," while "through" indicates passing from one side to the other.
Sound alike and spelled the same, but have different meanings:
* Sale/Sail: "Sale" refers to a discounted price, while "sail" is a piece of fabric used to propel a boat.
* Sane/Sain: "Sane" means mentally sound, "Sain" is a archaic word for "Saint."
This is just a small sampling of homophones beginning with "s". There are many more out there!