1) Categorized 2) Characterized 3) Classified as 4) Considered 5) Labeled 6) Marked with a tag 7) Pigeonholed 8) Regarded as 9) Tagged 10) Written off as 1) Labeled 2) Tabbed 3) Tagged 
• of Label
applies to molecules, in which atoms have been replaced by other isotopes of the same elements, allowing the use of the molecules as tracers