For height:
* haut (masculine) - This is the most common and general word for "high".
* haute (feminine) - This is the feminine form of "haut".
For altitude:
* élevé (masculine) - This is more formal and used for things like altitude or elevation.
* élevée (feminine) - This is the feminine form of "élevé".
For other meanings of "high":
* haut - This can also be used for things like "high quality" or "high speed".
* fort - This can be used for "high" in terms of intensity or strength.
Examples:
* Un bâtiment haut - A tall building
* Une montagne haute - A high mountain
* Un avion élevé - A high-flying plane
* Une qualité haute - High quality
* Un son fort - A loud sound
The best word to use depends on the specific situation and what you are trying to convey.