As an adjective optical

is of, or relating to sight; visual.

As a noun densitometry is

the measurement of optical density by use of a densitometer.

As nouns the difference between density and densitometry

is that density is (physics) a measure of the amount of matter contained by a given volume while densitometry is the measurement of optical density by use of a densitometer.

As nouns the difference between body and densitometry

is that body is a bodysuit , chiefly worn by women and children while densitometry is the measurement of optical density by use of a densitometer.

As nouns the difference between restructuring and dehubbing

is that restructuring is a reorganization; an alteration of structure while dehubbing is the restructuring of airliner routes to avoid a congested hub airport.

As a verb restructuring

is present participle of lang=en.

As nouns the difference between airliner and dehubbing

is that airliner is a passenger-carrying aircraft, especially one of a fleet operated by an airline while dehubbing is the restructuring of airliner routes to avoid a congested hub airport.

As nouns the difference between route and dehubbing

is that route is a course or way which is traveled or passed while dehubbing is the restructuring of airliner routes to avoid a congested hub airport.

As a verb route

is to direct or divert along a particular course.

As a verb congested

is (congest).

As a noun dehubbing is

the restructuring of airliner routes to avoid a congested hub airport.

As nouns the difference between hub and dehubbing

is that hub is the central part, usually cylindrical, of a wheel; the nave while dehubbing is the restructuring of airliner routes to avoid a congested hub airport.

As nouns the difference between airport and dehubbing

is that airport is airport while dehubbing is the restructuring of airliner routes to avoid a congested hub airport.

As verbs the difference between cap and decapping

is that cap is to extend one's leg for walking; get a move on while decapping is .

As a noun decapping is

the removal of a cap, especially the enzymatic removal of a cap from mrna.