I'm looking for words that contain at least two other overlapping words. Word category or origin do not matter (in particular, constituent and containing terms may differ in these regards). Of course, convincing arguments why this quest is in vain or will only produce esoteric results are welcome, too, as are hints to suitable resources.
Background: work related to full text queries of a specialized search engine.
Obviously, I haven't come up with any.
grapefruit bat would be a candidate if it would exist ...