Mutlaq: the relevant object or class without the qualification under discussion.
Muqayyad: that object or class together with an added relevant attribute or condition.
Examples:
“Student” — someone in the class of students.
“Diligent student” — a student further qualified by diligence.
“Garden” — the basic class.
“Fruit-bearing garden” — a garden with an added feature.
The task is to connect the attribute to the precise noun it limits, rather than classifying an expression by its length.