hypodensity

As nouns the difference between terms and hypodensity

is that terms is while hypodensity is (medicine) an area of an x-ray image that is less dense than normal, or than the surrounding areas.

As an adjective dense

is having relatively high density.

As a noun hypodensity is

(medicine) an area of an x-ray image that is less dense than normal, or than the surrounding areas.