Modifiers matching degree:

• liberal,
• advanced,
• specialized,
• higher,
• professional,
• scientific,
• educational,
• level,
• new,
• medical,
• extra,
• formal,
• clinical,
• graduate,
• vocational,
• postgraduate,
• primary,
• technical,
• relevant,
• doctoral,
• general,
• major,

Simple categories matching postgraduate:

• institution,
• study,
• education,
• degree,