As a noun motion

is (uncountable) a state of progression from one place to another.

As a verb motion

is to gesture indicating a desired movement.

As an adjective prograde is

(astronomy) describing motion in a forward direction, especially with respect to other bodies in the same system.

As adjectives the difference between forward and prograde

is that forward is toward the front or at the front while prograde is (astronomy) describing motion in a forward direction, especially with respect to other bodies in the same system.

As a noun forward

is (dialectal|or|obsolete) agreement; covenant or forward can be (rugby) one of the eight players (comprising two props, one hooker, two locks, two flankers and one number eight, collectively known as the pack) whose primary task is to gain and maintain possession of the ball (compare back).

As an adverb forward

is towards the front or from the front.

As a verb forward

is to advance, promote.

In geology|lang=en terms the difference between metamorphic and prograde

is that metamorphic is (geology) having been structurally altered as a result of, or resulting from, exposure to intense heat and/or pressure (at the contact zone between colliding plates, for example) while prograde is (geology) describing a metamorphic change resulting from a higher pressure or temperature.

As adjectives the difference between metamorphic and prograde

is that metamorphic is (geology) having been structurally altered as a result of, or resulting from, exposure to intense heat and/or pressure (at the contact zone between colliding plates, for example) while prograde is (astronomy) describing motion in a forward direction, especially with respect to other bodies in the same system.

As a noun metamorphic

is (mineralogy) a rock that has been changed from its original form by subjection to heat and/or pressure.

As nouns the difference between xanthine and xanthinuria

is that xanthine is (chemistry) any of a group of alkaloids that include caffeine, theophylline, and theobromine as well as the parent compound, a precursor of uric acid found in many organs of the body while xanthinuria is an abnormally high level of xanthine in one's urine.

As nouns the difference between urine and xanthinuria

is that urine is urine while xanthinuria is an abnormally high level of xanthine in one's urine.

As nouns the difference between peptidase and procollagen

is that peptidase is (enzyme) any enzyme that catalyzes the hydrolysis of peptides into amino acids; a protease while procollagen is (biochemistry) the precursor of collagen; it is formed in fibroblasts and converted to collagen by a peptidase.

As a noun degeneration

is degeneration, morbidity.

As an adjective prodegenerative is

that leads to degeneration.

As nouns the difference between pharmaceutical and probenecid

is that pharmaceutical is (medicine) a pharmaceutical or pharmacological preparation or product; a drug while probenecid is a particular pharmaceutical drug used to treat hyperuricemia.

As an adjective pharmaceutical

is (medicine) of, or relating to pharmacy or pharmacists.

As nouns the difference between drug and probenecid

is that drug is (pharmacology) a substance used to treat an illness, relieve a symptom, or modify a chemical process in the body for a specific purpose or drug can be (obsolete) a drudge while probenecid is a particular pharmaceutical drug used to treat hyperuricemia.

As a verb drug

is to administer intoxicating drugs to, generally without the recipient's knowledge or consent or drug can be (drag).

As nouns the difference between hyperuricemia and probenecid

is that hyperuricemia is an abnormally high level of uric acid in one's blood while probenecid is a particular pharmaceutical drug used to treat hyperuricemia.