Large:
* Grand: This is the most common and general term for "large".
* Gros: This implies a large size, often with a connotation of thickness or bulkiness.
* Énorme: This means "huge" or "enormous".
* Immense: This refers to a vast size, often used for things like landscapes or the ocean.
* Vast: This translates directly to "vast" and is used for things that are very large in extent.
Heavy:
* Lourd: This is the general term for "heavy".
* Pesant: This can be used for weight, but also for something that feels emotionally heavy.
* Épais: This implies something that is thick and heavy.
* Massif: This means "massive" and refers to something that is very large and heavy.
Examples:
* Un grand arbre (A large tree)
* Une grosse voiture (A big car)
* Un énorme gâteau (A huge cake)
* Une lourde boîte (A heavy box)
* Un pesant silence (A heavy silence)
It's important to consider the context and the specific meaning you want to convey when choosing the appropriate word.