Pixels and physical size
Distinguish an image's pixel dimensions from its printed dimensions. A file can look adequate on a small screen yet provide limited detail at a larger print size. Check the intended output before judging adequacy.
Vector and raster
Compare a shape described by paths with an image made from pixels. Scaling and editing behave differently in each. Choose a format according to the work's needs, not because one term sounds more professional.
Colour and output
RGB and CMYK describe different colour models. Confirm the workflow and destination before conversion, then inspect a proof. A glossary becomes valuable when it prevents a production misunderstanding.