The French word for 'speech' is 'discours'. It is used to describe both a formal address or discourse to an audience, and the ability to express thoughts and feelings by articulate sounds.

The French word for evidence is 'preuve'. It can be used in either a legal context to mean 'proof' or 'evidence', or in a more casual context to suggest that something serves as proof of something else. Similar to English, it can be used in a variety of situations and its meaning often depends on context.

The French word 'laboratoire' translates to 'lab' in English. It can be used in the same context - to refer to a place where scientific research or experiments are carried out. However, unlike English, it does not shorten to 'labo' in casual conversation.

The French word for 'river' is 'rivière'. It is used in the same context as in English, to denote a large natural stream of water flowing in a channel to the sea, a lake, or another river. Examples of its use could be 'La Seine est une grande rivière en France' which means 'The Seine is a big river in France'.

The French equivalent for 'yourself' is 'toi-même'. It's often used in the same contexts as the English word, e.g., when referring to the person you're speaking to. Like in English, it's primarily used in reflexive contexts and to emphasize the individuality of the person being referred to. For instance, 'Believe in toi-même' translates to 'Believe in yourself'.

The French word for 'while' is 'pendant'. It is used in a similar way to the English 'while', indicating something that is happening at the same time as another action. It can also mean 'during' or 'for' when referring to a span of time. Examples include 'Je lis pendant que tu dors' which translates to 'I read while you sleep' and 'J'ai travaillé pendant trois heures' which means 'I worked for three hours'.