exorbitant

As an adjective exorbitant

is exceeding proper limits; extravagant; excessive or unduly high.

As a verb get is

(label) to obtain; to acquire.

As a noun get is

offspring or get can be (british|regional) a git or get can be (judaism) a jewish writ of divorce.

As adjectives the difference between luxury and exorbitant

is that luxury is very expensive while exorbitant is exceeding proper limits; extravagant; excessive or unduly high.

As a noun luxury

is very wealthy and comfortable surroundings.

As adjectives the difference between exorbitant and undefined

is that exorbitant is exceeding proper limits; extravagant; excessive or unduly high while undefined is lacking a definition or value.

As adjectives the difference between exorbitant and limited

is that exorbitant is exceeding proper limits; extravagant; excessive or unduly high while limited is with certain (often specified) limits placed upon it.

As a verb limited is

(limit).

As adjectives the difference between exorbitant and minuscule

is that exorbitant is exceeding proper limits; extravagant; excessive or unduly high while minuscule is written in minuscules, lower-case.

As a noun minuscule is

a lower-case letter.

As adjectives the difference between exorbitant and sheer

is that exorbitant is exceeding proper limits; extravagant; excessive or unduly high while sheer is (textiles) very thin or transparent.

As an adverb sheer is

(archaic) clean; quite; at once.

As a noun sheer is

(nautical) the curve of the main deck or gunwale from bow to stern.

As a verb sheer is

(chiefly|nautical) to swerve from a course.