In computing terms the difference between segment and block

is that segment is a region of memory or a fragment of an executable file designated to contain a particular part of a program while block is a region of code in a program that acts as a single unit, such as a function or loop.

As nouns the difference between segment and block

is that segment is a length of some object while block is a substantial, often approximately cuboid, piece of any substance.

As verbs the difference between segment and block

is that segment is to divide into segments or sections while block is to fill (something) so that it is not possible to pass.

As nouns the difference between fixation and retentiveness

is that fixation is the act of fixing while retentiveness is the state of being retentive.

As nouns the difference between possum and squirrel

is that possum is an opossum, a marsupial of the family Didelphidae of the Americas while squirrel is any of the rodents of the family Sciuridae distinguished by their large bushy tail.

As a verb squirrel is

to store in a secretive manner, to hide something for future use.

As nouns the difference between insight and opinion

is that insight is a sight or view of the interior of anything; a deep inspection or view; introspection; frequently used with into while opinion is opinion.

As nouns the difference between echo and ultrasonography

is that echo is echo (a reflected sound that is heard again by its initial observer) while ultrasonography is (medicine) the use of ultrasound to produce diagnostic images of the internal organs of the body, or of a foetus.

As adjectives the difference between oppressive and expressive

is that oppressive is burdensome or difficult to bear while expressive is effectively conveying thought or feeling.

As a verb explore

is to seek for something or after someone.

As an adjective academic is

belonging to the school or philosophy of Plato; as, the academic sect or philosophy.

As a noun academic is

a follower of Plato, a Platonist.

As verbs the difference between swelted and melted

is that swelted is past tense of swelt while melted is past tense of melt.

As an adjective melted is

being in a liquid state as a result of melting.

As nouns the difference between nonfiction and facts

is that nonfiction is written works intended to give facts, or true accounts of real things and events. Often used attributively while facts is plural of lang=en.

As nouns the difference between truth and nonfiction

is that truth is the state or quality of being true to someone or something while nonfiction is written works intended to give facts, or true accounts of real things and events. Often used attributively.

As a verb truth

is to assert as true; to declare, to speak truthfully.