starchiness

As nouns the difference between starch and starchiness

is that starch is (uncountable) a widely diffused vegetable substance found especially in seeds, bulbs, and tubers, and extracted (as from potatoes, corn, rice, etc) as a white, glistening, granular or powdery substance, without taste or smell, and giving a very peculiar creaking sound when rubbed between the fingers it is used as a food, in the production of commercial grape sugar, for stiffening linen in laundries, in making paste, etc while starchiness is the property of being starchy.

As a verb starch

is to apply or treat with laundry starch, to create a hard, smooth surface.

As an adjective starch

is stiff; precise; rigid.

As nouns the difference between starchiness and starchness

is that starchiness is the property of being starchy while starchness is the quality of being starched; stiff formality.