French。
French can be an adjective or a noun. When it is an adjective, it means "French; French; French. " When it is a noun, it means "French". The French is usually used to mean "French".
Example:
Two-thirds of the French are in favour of limiting foreign imports into Europe.
Two-thirds of French people are in favor of restricting the import trade in Europe.
The villagers spoke French.
The villagers speak French.
Frenchman。
French is a countable noun, which means "French (male)" and its plural form is Frenchman.
Examples are as follows:
Look! There are three Frenchmen under the tree.
Look, there are three French people under the tree.