No, a "purpose or qualifier" is (usually) the defining characteristic of a noun. For example, power infrastructure vs water infrastructure. If you said "power

No, a "purpose or qualifier" is (usually) the defining characteristic of a noun. For example, power infrastructure vs water infrastructure. If you said "power Danish infrastructure" or "water Danish infrastructure", power/water don't make sense as adjectives. Sometimes "critical" is a qualifier like "critical condition" but in this case, it's a quality.