A

A/An

Absolute Modifiers

Accept/Except

Accuse/Allege

Across/Acrossed/Cross

Adapt/Adopt

Administer/Administrate

Aggravate/Irritate

Ain't

A hold/Ahold

A lot/Allot/Alot

Already/All Ready

Alright/All Right

Alternate(ly)/Alternative(ly)

Altogether/All Together

Always/All Ways

American Grammar vs. British Grammar

Among/Between

Amount/Number

Ante-/Anti-

Anxious/Eager

Anymore

Anyone/Any One

Anyway/Any Way

Anyways

Anywheres

Apart/A part

As/Like

As To

Assume/Presume

At after Where

A Ways

Awhile/A While

B

Bad/Badly

Because after Reason

Being As or Being That

Beside/Besides

Between/Among

Blatant/Flagrant

Blond/Blonde

Bring/Take

British Grammar vs. American Grammar

Burst/Bust/Busted

C

Can/May

Can't Help But

Clipped Words

Compose/Comprise

Continual/Continuous

Convince/Persuade

Could Have/Could Of

Credible/Credulous/Creditable

Cross/Across/Acrossed

Cult/Occult

D

Decisive/Incisive

Definite/Definitive

Different From/Different Than

Diffuse/Defuse

Disinterested/Uninterested

Done as Verb

Doesn't/Don't

Due To

Due To the Fact That

E

Economic/Economical

Emigrate/Immigrate

Enthused/Enthusiastic

Envious/Jealous/Suspicious

Equivocal/Equivocable

Especial(ly)/Special(ly)

Everyone/Every One

Everywheres

Exalt/Exult

Except/Accept

F

Farther/Further

Fewer/Less

Flagrant/Blatant

For Free

Fortunate/Fortuitous

G

Gone/Went

Good/Well

H

Hanged/Hung

Have or Had plus Ought

Have after Could, Would, Should, or Will

Healthful/Healthy

Height or Heighth

Hers/Her's

Historic/Historical

Hopefully

Hypo-/Hyper-

Hypocritical/Hypercritical

I

I Hope/Hopefully

Immigrate/Emigrate

Imply/Infer

In after Want

Incisive/Decisive

Incredible/Incredulous

Indeterminate/Indeterminable

Irregardless/Regardless

Irritate/Aggravate

Its/It's

J

Jealous/Envious/Suspicious

Jiggle/Joggle/Juggle

Judicious/Judicial/Juridical

Just, Use of

K

Kind Of, Use of

L

Lay/Lie

Leave/Let

Lend/Loan

Less/Fewer

Less/Littler (More Little)

Like/As

Lie/Lay

Literal(ly)

Littlest/Least

Loath/Loathe

Luxuriant/Luxurious

M

Macro-/Micro-

Magnificent/Munificent

Manic/Maniac

May/Can

Maybe/May Be

Morale/Moral

N

Nowheres

Number/Amount

O

Occult/Cult

Of, Use of

Of after Would, Could, Should, or Will

Official/Officious

Orient/Orientate

Only, Use of

Ought with Have or Had

P

Parameter/Perimeter

Perimeter/Parameter

Persecute/Prosecute/Prosecution

Perspective/Prospective

Persuade/Convince

"Prepositions Ending Sentences"

Prescribe/Proscribe/Prescription

Presume/Assume

Proscribe/Prescribe/Prescription

Prosecute/Persecute/Prosecution

Prospective/Perspective

Q

Quash/Squash

Quote/Quotation/Quotation Mark

R

Raise/Rise

Real/Really

Reason with Because

Regardless/Irregardless

Renown/Reknown

S

Says/Said

Seen/Saw

Sensual/Sensuous

Set/Sit

Should Have/Should Of

Single/Singular

Solid/Stolid

Somewheres

Sort Of

Special(ly)/Especial(ly)

"Split Infinitives"

Squash/Quash

Strategy/Tactics

Supposed to/Suppose to

Sure/Surely

Suspicious/Jealous/Envious

T

Tactics/Strategy

Take/Bring

Tenet/Tenant

Than/Then

That/Where

That There and This Here

That/Which/Who

Them/Those

Then/Than

There/Their/They're

There's/Theirs/Their's

To/Too/Two

Tortuous/Torturous/Tortured

Try And/Try To

Turbid/Turgid

U

Unequivocal/Unequivocable

Uninterested/Disinterested

Unique (and Other Absolute Modifiers)

Used to/Use to

W

Want followed by In, Out, Off, Down, or Up

Warranty/Warrantee/Warrant

Ways after A

Well/Good

Went/Gone

Where Followed by At

Where/That

Who/Which/That

Who/Whom

Who's/Whose

Will Have/Will Of

-Wise (Suffix)

Would Have/Would Of