It’s a noun, an idiomatic expression which means a random assortment of things; small remaining pieces and things. Synonyms are farrago, hodgepodge, hotchpotch, melange, mingle-mangle, mishmash, oddments, omnium-gatherum, ragbag.
The word that comes to mind is “hotspot”, but no it’s different.
hotchpotch comes from French hochepot, from hocher (“to shake”) + pot (“pot”); of Dutch or German origin. Dutch, hutspot.
It’s a noun, and plural is hotchpotches. It means a collection containing a variety of miscellaneous things. Synonyms are farrago, hodgepodge, melange, mingle-mangle, mishmash, oddments, odds and ends, omnium-gatherum, ragbag.