Ambiguous noun
A number or measure is stated, but its kind is missing: مِتْرَانِ حَرِيْرًا.
Ambiguous sentence meaning
The statement is grammatically complete, but an intended respect is missing: حَسَنٌ وَجْهًا.
In both uses, tamyiz supplies the missing specification: the kind of a counted or measured noun, or the respect intended by a complete sentence.