A Taxonomy (of sorts)

Those things having to do with electricity:
-adapter plug
-battery
Those things having to do with paper:
-small paper clip
-large paper clip
Those things having to do with the outdoors:
-embroidered patch (of the hiking variety)
-coral
Those things having to do with or belonging to children:
-painted block
-whistle
These classifications compiled by:
-Walter M.
-Jenn O.
-Alex C.
-Heath B.