For a sixth grade spelling bee, try to incorporate some of the words that they hear around the classroom. Also, start out with simple words and gradually progress to tougher ones.
South
Orange
Meal
Suffer
Wing
Scan
Author
Shallow
Seedless
Cucumber
Symbol
Essay
Written
Sign
Guest
Melody
Cannon
Garnish
Scuba
Purple
Bottom
Eleven
Cruise
Scant
Truthful
Fray
Wooden
Fowl
Honestly
Kiwi
Strive
Canine
Zebra
Mellow
Library
Truth
Flaw
Mild
Banana
Deli
Bolster
Trigger
Frantic
Earring
Stomach
Mildew
Difference
Minor
Painting
Ally
Junior
Scheme
Portal
Video
Disc
Mentor
Neutral
Cookie
Chocolate
Commonplace
Scratch
Wither
Whilst
Twilight
Camera
Pencil
Anemic
Trace
Toast
Trite
Banal
Motor
Fraught
Gradual
Silence
Dredge
Flank
Scowl
Billow
Scalp
Region
Trivia
Value
Assist
Carnivore
Acquire
Tangent
Scruple
Cavity
Placebo
Legumes
Viral
Caterer
Truce
Solemn
Chivalry
Mechanic
Psychic
Pleasure
Mesmerize
Glamorous
Lenses
Deposit
Habit
Triangle
Heart
Shimmering
Blasphemy
Calamity
Dexterous
Paranormal
Blitz
Wilderness
Immaculate
Hibernate
Discus
Cellophanes
Possibility
Hyper
Addiction
Measles
Influenza
Vacuum
Vinyl
Stethoscope
Plethora
Oscilloscope
Litigate
Infatuation
Corporation
Business
Noble
Filament
Hibernate
Medication
Meaning
Cabin
Necklace
Blonde
Tress
Source
Victim
Grounded
Student
Employee
Professor
Quality
College
Frowned
Possum
Fraternity
Cavity
Stoic
Transit
Fragment
Protein
Dairy
Lactose
Forte
Dynamic
Below
Frolic
Scorn
Teary
Mighty
Giggle
Swine
Enemy
Musical
Liberate
Warehouse
Matriculate
Alumni
Millennium
Pinnacle
Clothes
Jewelry
Vesicle
Vocation
Expand
Feather
Dignity
Promise
Lesson
Laughing
Volley
Turf
Tinsel
Heinous
Stench
Telephone
Internet
Divine
Orchestra
Primate
Carnal
Vegetable
Computer
Knowledge
Create
Teacher
Stamina
Maximum
Strength
Weird
Normal
Liquefy
Validate
Appreciate
Toxicity
Hydrate
Formula
Recipe
Trenches
Trapezoid
Explosion
Foreshadow
Squeeze
Ability
Tactful
Morph
Equator
Nexus
Assimilate
Marsupial
Universe
Planet
Fathom
Mediocre
Kinetic
Phonetic
Dynamic
Plastic
Particle
Science
Addition
Divide
Scorn
Government
Geometry
Carbohydrate
Essence
Fraction
Floral
Trudge
Meteor
Flail
Disciplinary
Chrome
Scallion
Scissors
Tremble
Calendar
Metabolism
Wednesday
Embassy
Antagonize
Triple
Perfunctory
Multiply
Century
Judge
Mayor
Principal
Student
Mathematics
Language
Skillet
Elementary
Maiden
Privatize
Society
Functionality
Fictional
Assurance
Disability
Fragmented
Mobilization
Synonym
Eternity
Twentieth
Majority
Swallow
Prairie
Colossal
Fierce
Trickle
Salmonella
Flexible
President
Bicep
Clench
Tricycle
Education
Congress
Potato
Svelte
Alabaster
Scoliosis
Skeleton
Neutron
Portion
Infinite
Tradition
Culture
Heritage
Impervious
Cranium
Bicentennial
Pragmatic
Impractical
Pharynx
Hackneyed
Beleaguered
Fortitude
Daffodil
Plentiful
Porcelain
Hydrangea
Centennial
Mercantilism
Acquaintance
Athleticism
Implicit
Hemorrhage
Indispensable
Subordinate
Acquit
Conscientious
Hierarchy
Cafeteria
Bombarded
Chrysanthemum
Contusion
Metaphorical
Ambiguous
Tenacious
Monstrosity
Paleontology
Orthopedist
Parameters
Auditorium
Tertiary
Narcissistic
Persnickety
Troublesome
Ventricle
Vestibule
Auxiliary
Pessimism
Pterodactyl
Vegetarianism
Omnipresent
Terrarium
Arboretum
Pneumonia
Flanges
Solidarity
Metamorphosis
Tetrahedron
Epitome
Punctuality
Audacious
Chiropractor
Cuckold
Inundate
Methodical
Continuity
Fractional
Skittish
Contusion
Excrement
Syncopation
Evangelical
Melancholy
Posterior
Anatomical
Anterior
Fabricated
Exacerbated
Buttress
Palpate
Phlegm
Nuance
Cataclysmic
Apocalyptic
Pneumatic
Amoeba
Indoctrinate
Cornucopia
Entourage
Facsimile
Reciprocal
Relinquish
Spherical
Ubiquitous
Paranoia
Exuberant
Superiority
Confidentiality