IOP vs force per unit area

IOP and force per unit area both are nouns.

Word	Noun	Adjective	Verb	Adverb
IOP	Yes	No	No	No
force per unit area	Yes	No	No	No

As nouns, force per unit area is a hypernym of IOP; that is, force per unit area is a word with a broader meaning than IOP:

IOP: pressure exerted by the fluids inside the eyeball; regulated by resistance to the outward flow of aqueous humor
force per unit area: the force applied to a unit area of surface; measured in pascals (SI unit) or in dynes (cgs unit)

Other hypernyms of IOP include pressure, pressure level.

IOP (noun)	force per unit area (noun)
pressure exerted by the fluids inside the eyeball; regulated by resistance to the outward flow of aqueous humor	the force applied to a unit area of surface; measured in pascals (SI unit) or in dynes (cgs unit)