Tool, Act, Result, or Process

Each pair below looks nearly identical but names a different thing: an instrument, an act, a result, or a field.

PairDistinction
bronchoscope / bronchoscopyviewing tool / act of visual examination
cystoscope / cystoscopyviewing tool / act of visual examination
angiogram / angiographyimage or record / process of making vessel images
mammogram / mammographybreast image / process of imaging the breast
cardiologist / cardiologyheart specialist / heart specialty