土 / 士: how to tell them apart
In 土 the bottom stroke is longer; in 士 (战士, 护士) the top stroke is longer.
土 tǔ — soil, earth
土
| 泥土 | ní tǔ | soil | 2B lesson 15 |
士 shì — scholar, soldier
士
| 巴士 | bā shì | bus | 1A lesson 4 | |
| 护士 | hù shi | nurse | 2A lesson 8 | |
| 骑士 | qí shì | knight / horseman | 4A lesson 8 |