No, couchand is right. Now a font is the file (you're almost right on it’s origin, it originates from steel punchcutting where each point size did need it’s own

No, couchand is right. Now a font is the file (you're almost right on it’s origin, it originates from steel punchcutting where each point size did need it’s own font). So a font is helvetica-bold.otf not Helvetica Bold. Helvetica Bold is a weight of Helvetica. (All of this is likely to alter slightly though with the advent of variable fonts.)