Accept - to receive, understand
Except - not included

Aid - to provide support for or relief to; help
Aide - a person who is an assistant or helper

Advice - recommendation regarding a decision or course of conduct
Advise - to give advice to (when you advise someone you give them advice) verb

Affect - to influence
Effect - the result

Allusion - to indirectly reference
Illusion - to mislead or deceive

A lot is two words
Allot - means to assign

Among - more than two choices
Between - two choices

Bare - without covering or clothing; naked; nude -
Bear - to hold up; support: to bear the weight of the roof - bear the pain

Brake - a device for slowing or stopping a vehicle
Break - to smash, split, or divide into parts violently; reduce to pieces or fragments

Can - ability to do
May - to be allowed

Capital - city, letter, $
Capitol - a governmental building

Complement - to complete
Compliment - to flatter

Confidant - someone entrusted with another's secrets
Confident - to be assured of something

Connotation - implied meaning
Denotation - actual meaning

Diner - A small, usually inexpensive restaurant with a long counter and booths
Dinner - The chief meal of the day, eaten in the evening or at midday.

Discover - finding something
Invent - creating something

Emigrate - moving from
Immigrate - moving to

Fewer - smaller in number, actually countable
Less - reduction

Heal - to make healthy, whole, or sound; restore to health; free from ailment
Heel - back part of the human foot, below and behind the ankle - a solid, raised base or support of leather, wood, rubber, etc., attached to the sole of a shoe or boot under the back part of the foot

Its - possessive form of "it"
It's - contraction for "it is"

Knew - the past tense of "know" - to have perceived or understood as fact or truth - He knew that information would come in handy.
New - of recent origin, production, purchase, etc.

Lay - put something down
Lie - to recline

Loose - not tight
Lose - defeated or misplaced

Passed - past tense of "pass"
Past - time or distance

Pedal - a foot-operated lever used to control certain mechanisms
Petal - one of the usually brightly coloured leaf-like parts of a flower

Principal - person
Principle - rule or standard

Sight - to visually see
Site - a place

Stationary - to not move
Stationery - writing paper

Suit - a set of garments of the same color and fabric
Suite - a connected series of rooms to be used together

Than - to compare
Then - used with time

Their - possessive form of "they"
There - that place
They're - contraction of "they are"

Thread - twisted filaments or fibers of any kind used for sewing
Tread - to set down the foot or feet in walking; step; walk

To - toward a direction
Too - also
Two - the number 2

Waist - The part of the human trunk between the bottom of the rib cage and the pelvis
Waste - use, consume, spend, or expend thoughtlessly or carelessly

Wander - To move about without a definite destination or purpose
Wonder - A feeling of puzzlement or doubt.

Weather - the state of the atmosphere with respect to wind, temperature, cloudiness, moisture, pressure, etc.
Whether - used to introduce the first of two or more alternatives - introduce a single alternative, the other being implied or understood: See whether or not she has come. I doubt whether we can do any better.

Weak- lacking in bodily strength or healthy vigor, as from age or sickness
Week - a period of seven successive days

Your - possessive form of "you"
You're - contraction of "you are"