Modifiers matching liberty:

• substantive,
• basic,
• individual,
• precious,
• major,
• political,
• essential,

Simple categories matching substantive:

• concept,
• issue,
• task,
• topic,
• theory,
• protection,
• consideration,
• activity,
• domain,
• values,
• crime,
• law,
• tier,
• matter,
• news,
• interest,
• document,
• committee,
• goal,
• area,
• skill,
• way,
• part,
• liberty,
• discipline,
• field,