As a noun ozone

is an allotrope of oxygen (symbol O₃) having three atoms in the molecule instead of the usual two; it is a blue gas, generated from oxygen by electrical discharge.

As a proper noun Alex is

a given name derived from Ancient Greek.

As nouns the difference between confusion and puzzle

is that confusion is confusion while puzzle is puzzle.

In obsolete terms the difference between confusion and question

is that confusion is disgrace, shame while question is to argue; to converse; to dispute.

As nouns the difference between confusion and question

is that confusion is a lack of clarity or order while question is a sentence, phrase or word which asks for information, reply or response; an interrogative.

As a verb question is

to ask questions of; interrogate; enquire; ask for information.

As adjectives the difference between reluctant and intransigent

is that reluctant is opposing; offering resistance (to) while intransigent is unwilling to compromise or moderate a position; unreasonable; irreconcilable; stubborn.

In obsolete terms the difference between fell and compassion

is that fell is eager; earnest; intent while compassion is to pity.

As verbs the difference between fell and compassion

is that fell is to make something fall; especially to chop down a tree while compassion is to pity.

As nouns the difference between fell and compassion

is that fell is that portion of a kilt, from the waist to the seat, where the pleats are stitched down while compassion is deep awareness of the suffering of another, coupled with the wish to relieve it.

As an adjective fell

is of a strong and cruel nature; eagre and unsparing; grim; fierce; ruthless; savage.

As an adverb fell

is sharply; fiercely.

As an adjective waivered

is allowed by waiver; permitted by exception granted from otherwise applicable rules.

As a verb waive is

to outlaw (someone).

As a noun waive is

a woman put out of the protection of the law; an outlawed woman.

As nouns the difference between realizability and practicality

is that realizability is the property or characteristic of being realizable while practicality is (uncountable) the state of being practical or feasible.

As nouns the difference between leapfrog and bypass

is that leapfrog is a children's game in which players vault over each other's stooped backs while bypass is a road that passes around something, such as a residential area.

As verbs the difference between leapfrog and bypass

is that leapfrog is to jump over some obstacle as in leapfrog while bypass is to avoid an obstacle etc, by constructing or using a bypass.

As an adjective doable

is possible to do; feasible.

As a noun practicality is

the state of being practical or feasible.

As nouns the difference between compulsory and core

is that compulsory is something that is compulsory or required while core is crow.

As an adjective compulsory

is required; obligatory; mandatory.