Here are some options that work depending on the context:
* A collection of bones: This is a general and straightforward term.
* A skeleton: If the bones belong to a single organism and form a complete skeleton.
* A bone bed: This refers to a geological deposit where a large number of bones are found together.
* A cache of bones: This implies a hidden or concealed group of bones.
* A trove of bones: This suggests a large and valuable collection of bones.
* A pile of bones: This is a more informal and descriptive term.
Ultimately, the best term to use will depend on the specific situation and the impression you want to convey.