White: 白
白 means white and appears as a visible component in all three characters. 皓 means white or clear, but 舶 means a ship: there 白 is mainly a sound component (ハク), not a clue that the ship is white. 皐 has a more historical, less transparent connection to its listed meanings.
舶 and 皐 each have 11 strokes; 皓 has 12. Keep the 白 shape balanced, especially when it sits on top in 皐 and 皓.