As nouns the difference between validity and expiration

is that validity is the state of being valid, authentic or genuine while expiration is the act of expiring.

In lang=en terms the difference between fly and waft

is that fly is to travel very fast while waft is to be moved, or to pass, on a buoyant medium; to float.

In ergative|lang=en terms the difference between fly and waft

is that fly is (ergative) to cause to fly (travel or float in the air): to transport via air or the like while waft is (ergative) to (cause to) float easily or gently through the air.

In nautical|lang=en terms the difference between fly and waft

is that fly is (nautical) that part of a compass on which the points are marked; the compass card while waft is (nautical) a flag, (also called a waif or wheft), used to indicate wind direction or, with a knot tied in the center, as a signal.

As nouns the difference between fly and waft

is that fly is (zoology) any insect of the order diptera; characterized by having two wings, also called true flies or fly can be (obsolete) the action of flying; flight while waft is a light breeze.

As verbs the difference between fly and waft

is that fly is to travel through the air, another gas or a vacuum, without being in contact with a grounded surface or fly can be (baseball) to hit a fly ball; to hit a fly ball that is caught for an out compare ground (verb) and line (verb) while waft is (ergative) to (cause to) float easily or gently through the air.

As an adjective fly

is (slang|dated) quick-witted, alert, mentally sharp, smart (in a mental sense).

As verbs the difference between replicate and represent

is that replicate is to make a copy (replica) of while represent is to present again or anew; to present by means of something standing in the place of; to exhibit the counterpart or image of; to typify.

As a noun replicate

is an outcome of a replication procedure.

As an adjective replicate

is folded over or backward; folded back upon itself.

As a proper noun diamond

is of modern usage, from the name of the gem.

As a verb rocka is

.

As nouns the difference between incidence and severity

is that incidence is the act of something happening; occurrence while severity is the state of being severe.

As verbs the difference between contend and convict

is that contend is to strive in opposition; to contest; to dispute; to vie; to quarrel; to fight while convict is to find guilty.

As a noun convict is

(legal) a person convicted of a crime by a judicial body.

As verbs the difference between kill and abolish

is that kill is to put to death; to extinguish the life of while abolish is to end a law, system, institution, custom or practice .

As a noun kill

is the act of killing or kill can be a creek; a body of water; a channel or arm of the sea or kill can be a kiln.

In lang=en terms the difference between kill and cancel

is that kill is to force a company out of business while cancel is to offset or equalize something.

As verbs the difference between kill and cancel

is that kill is to put to death; to extinguish the life of while cancel is to cross out something with lines etc.

As nouns the difference between kill and cancel

is that kill is the act of killing or kill can be a creek; a body of water; a channel or arm of the sea or kill can be a kiln while cancel is a cancellation (us ); (nonstandard in some kinds of english).

As nouns the difference between saint and san

is that saint is a person to whom a church or another religious group has officially attributed the title of "saint"; a holy or godly person; one eminent for piety and virtue while san is a letter of the Archaic Greek alphabet (uppercase Ϻ, lowercase ϻ) that came after pi and before qoppa.

As a verb saint

is to canonize, to formally recognize someone as a saint.

As a proper noun San is

a member of the ethnically distinct, short-statured nomadic people of southern Africa.

As an acronym SAN is

styrene-acrylonitrile resin.

As adjectives the difference between ongoing and regular

is that ongoing is continuing, permanent while regular is bound by religious rule; belonging to a monastic or religious order (often as opposed to {{term|secular}}).

As nouns the difference between ongoing and regular

is that ongoing is something that is going on; a happening while regular is a member of the British Army (as opposed to a member of the Territorial Army or Reserve).