| 5000 Vocabulary List for Visiting Scholars in the USA - Page 219 | |||
| Word | Type | Used in a Sentence | Synonym |
| front | verb | We will front for the other company. | disguise |
| frontier | noun | America's frontier was the old West. | border |
| noun | We are on the frontier of space. | edge | |
| frost | noun | The frost will kill the vegetables. | freeze |
| noun | There was frost in her voice. | coldness | |
| frown | noun | He had a frown on his face. | scowl |
| verb | She frowned when she said it. | scowled | |
| fruit | noun | Success is the fruit of hard work. | yield |
| noun | We eat a lot of fresh fruit. | food | |
| fruitful | adj. | It has been a fruitful year. | worthwhile |
| frustrate | verb | Failure can frustrate hard workers. | disappoint |
| fry | verb | We shall fry a chicken for dinner. | cook with oil |
| fuel | noun | Coal is an important source of fuel. | energy |