In mineralogy terms the difference between quartz and pyrite

is that quartz is the most abundant mineral on the earth's surface, of chemical composition silicon dioxide, SiO₂. It occurs in a variety of forms, both crystalline and amorphous. Found in every environment while pyrite is the common mineral iron disulfide (FeS₂), of a pale brass-yellow color and brilliant metallic luster, crystallizing in the isometric system.

As verbs the difference between stagnate and tarnish

is that stagnate is to cease motion, activity, or progress: while tarnish is to oxidize or discolor due to oxidation.

As a noun tarnish is

oxidation or discoloration, especially of a decorative metal exposed to air.

As verbs the difference between wrecked and worsened

is that wrecked is past tense of wreck while worsened is past tense of worsen.

As an adjective wrecked

is destroyed in an accident etc.

As verbs the difference between better and strengthened

is that better is to improve while strengthened is (strengthen).

As an adjective better

is (good).

As an adverb better

is .

As a noun better

is an entity, usually animate, deemed superior to another; one who has a claim to precedence; a superior or better can be .

As nouns the difference between corresponding and congruency

is that corresponding is action of the verb to correspond while congruency is the quality of agreeing; being suitable and appropriate.

As a verb corresponding

is .

As an adjective corresponding

is that have a similar relationship.

As verbs the difference between decay and contaminated

is that decay is to deteriorate, to get worse, to lose strength or health, to decline in quality while contaminated is past tense of contaminate.

As a noun decay

is the process or result of being gradually decomposed.

As an adjective contaminated is

adulterated; impure.

As a letter f

is the sixth letter of the.

As a symbol f

is (label) symbol for fluorine.

As a preposition per is

for.

As adjectives the difference between adept and cunning

is that adept is well skilled; completely versed; thoroughly proficient while cunning is sly; crafty; clever in surreptitious behaviour.

As nouns the difference between adept and cunning

is that adept is one fully skilled or well versed in anything; a proficient; as, adepts in philosophy while cunning is (obsolete) knowledge; learning; special knowledge (sometimes implying occult or magical knowledge).

As a noun form

is shape.

As a conjunction of is

(subordinating ) whether, if.

As an adjective mean

is mid, central.

As a noun mean

is middle.