This is the place:

I just had a fellow FBer post this list. You all know me. I was like OH HELL YES! I love it so much I thought I'd share it:

Envy / Jealousy
Envy:  when someone else has something you want
Jealousy:  when you have something but are afraid of losing it

Fewer / Less:
Fewer:  is plural for a reduced amount, not as many (if you can count them)
Less:  is singular (also includes quantitative measurement) for a reduced amount, not as much (if you can’t count them)

Weather / Climate
Weather:  Atmospheric conditions over a short period of time
Climate:  Atmospheric behavior over long periods of time

Effect / Affect
Effect:  is a noun, a result
Affect:  is a verb, action taken to achieve a result

Gray / Grey
Gray:  is the color, sometimes a name
Grey: is a proper noun

Elevation / Altitude
Elevation:  height above sea level
Altitude:  height above the surface of the earth at a particular point

Accept / Except
Accept:  is a verb; to take possession of
Except: is an exclusionary preposition

Then / Than
Then:  chronological adverb
Than:  comparative conjunction

Advice / Advise
Advice:  noun, a recommendation
Advise:  verb, the process of making a recommendation

Draught / Draft
Draught:  flow of air
Draft:  (noun) initial and progressively refined version of something, (verb) create an initial and refined version(s)

Ensure / Assure / Insure
Ensure:  to make certain
Assure:  encouraging sentiment between individuals
Insure:  to provide compensation for based on risk, in event of loss

Stationary / Stationery
Stationary:  not moving
Stationery:  medium involved with aspects of writing

Capital / Capitol
Capital:  a city or resources
Capitol:  a place where legislators congregate

Emigrate / Immigrate
Emigrate:  to exit one country to settle in another
Immigrate:  to enter and settle in a country after leaving another

Etc./E.g./I.e.
Etc.:  Latin, et cetera “and so forth.”
E.g.:  Latin, exempli gratia, “for your example”
I.e.:  Latin, id est, “that is”

Lie / Lay (excluding telling an untruth)   --think about sit / set
Lie:  intransitive verb meaning to recline or rest on a surface
Lay:  transitive verb meaning to put or place

Complement / Compliment
Complement:  to go well with something; coordinate
Compliment:  a flattering statement

Continual / Continuous
Continual:  something that never stops
Continuous:  something that is continually reoccurring

Criteria / Criterion
Criteria:  plural of a standard or qualification
Criterion:  singular of a standard or qualification

Systematic / Systemic
Systematic:  organized or arranged according to a set plan
Systemic:  works as part of a system, or can affect the entire body or system as a whole

Discreet / Discrete
Discreet:  to be overly prudish or modest, avoiding attention
Discrete:  separate, apart from, isolated from another

Prophesy / Prophecy
Prophesy:  verb, to make predictions
Prophecy:  noun, an already stated prediction

Accuracy / Precision (my personal favorite)
Accuracy:  how closely a measurement approaches its true value or standard
Precision:  a consistently high degree of exactness

Typical / Atypical
Typical:  usual, routine, expected
Atypical:  NOT usual, NOT routine, NOT expected   -“atypical” is not an emphatic version of “typical”

“Intents and purposes,” NOT “intensive purposes”

“Chest of drawers,” NOT “chested, chestnut, or chester drawers”

“Could not care less,” NOT “could care less”

***Feel free to add more - I would love to update my list.

Love the list!  My favorites are listed here already.  (then/than, immigrate/emigrate, less/fewer)  What about unreal/ surreal?  uninterested/disinterested? misinformed/uninformed? and the ever-popular its/it's?  You would think these people had never gone to school, except that the teachers are often as badly informed as their students.  I remember team-teaching with a very nice lady who taught her class that feel and field were homonyms.  On the other hand, maybe those of us who are fixated on such things are missing out on something.  I have an open mind.  lol  JP

p.s. And then there's always the wiseass who says that's not how they say it in the UK, or the psychology major who insists that affect is a noun, or...