I saw a dinosaur skeleton at the museum.
There was a cat as thin as a skeleton by the roadside.
An old skeleton was found in the mountains.
He became as thin as a skeleton because of his illness.
The archaeologist excavated an ancient skeleton.
死骸 refers to a whole dead body, while 骸骨 refers specifically to a skeleton with the flesh gone.
骸骨 means a skeleton (bones of a body), a very different, literal meaning from 骨子's abstract sense of the gist or framework of an idea, despite sharing the kanji 骨.