A
- Abandon vs. abandonment
- Abjure vs. adjure
- Abolishment vs. abolition
- Aborted vs. abortive
- Abstruse vs. obtuse
- Accord vs. accordance
- Addiction vs. dependence
- Adopted vs. adoptive
- Adverse vs. averse
- Advert vs. avert
- Advice vs. advise
- Aesthetic vs. ascetic
- Afflict vs. inflict
- Aggression vs. aggressiveness
- Agnostic vs. atheist
- Alligator vs. crocodile
- Alternate vs. alternative
- Amiable vs. amicable
- Amoral vs. immoral
- Amount vs. number
- Amuse vs. bemuse
- Appropriate vs. expropriate
- Arouse vs. rouse
- Ascent, ascendance, ascendancy, etc.
- Asphalt, cement, concrete, pavement
- Assail vs. assault
- Assent vs. consent
- Assume vs. presume
- Attain vs. obtain
B
- Bald-faced vs. boldface
- Baloney vs. bologna
- Ban vs. bar
- Blatant vs. flagrant
- Blather vs. blither
- Breach, breech, broach
- Breath vs. breathe
- Broach vs. brooch
- But vs. yet
C
- Cacao vs. cocoa
- Cache vs. cachet
- Calvary vs. cavalry
- Cede vs. concede
- Centrifugal vs. centripetal
- Centrifuge vs. subterfuge
- Chasten vs. chastise
- Childish vs. childlike
- Chink vs. kink
- Clench vs. clinch
- Climactic and climatic
- Co-op vs. co-opt
- College vs. university
- Collegial vs. collegiate
- Colosseum and coliseum
- Comic vs. comical
- Commentator vs. commenter
- Compel vs. impel
- Comprise, compose
- Conceive vs. perceive
- Condemn, condone
- Connote, denote
- Contemporary vs. contemporaneous
- Contemptible vs. contemptuous
- Continual vs. continuous
- Coral vs. corral
- Cornet vs. coronet
- Corollary vs. correlation
- Cosmetology vs. cosmology
- Crevice vs. crevasse
D
- Decent vs. descent
- Decry vs. descry
- Deduction vs. induction
- Defuse vs. diffuse
- Demur vs. demure
- Deprecate, depreciate, and self-deprecating
- Destroy, destruct, self-destruct
- Detract vs. distract
- Device and devise
- Dialectal vs. dialectical
- Disassemble vs. dissemble
- Dispense with vs. dispose of
- Double and redouble
- Dove vs. dived
- Downfall vs. downside
E
- Earthy vs. earthly
- Economic vs. economical
- Economics vs. finance
- Elegy vs. eulogy
- Emigrate vs. immigrate
- Empathy vs. sympathy
- Endemic vs. epidemic
- Enervate and innervate
- Enormity
- Entomology vs. etymology
- Envelop vs. envelope
- Envision vs. envisage
- Epigram vs. epigraph
- Equable, equatable, equitable
- Estimate vs. estimation
- Evoke vs. invoke
- Exhibit vs. exhibition
F
- Falsehood, falsity, and falseness
- Fearful vs. fearsome
- Fervid vs. fervent
- Fictional vs. fictitious
- Financer vs. financier
- Flaunt vs. flout
- Flesh out vs. flush out
- Flounder vs. founder
- Forbidding vs. foreboding
- Fortuitous vs. fortunate
- Frankenstein, Frankenstein's monster
- Fritter away
- Frivolity vs. frivolousness
G
- Gambit
- Gantlet vs. gauntlet
- Gibe, jibe, jive, gybe
- Grammar vs. usage
H
- Half-mast and half-staff
- Hanged vs. hung
- Healthful vs. healthy
- Heterogeneous vs. heterogenous
- Historic vs. historical
- Home in vs. hone in
- Homely vs. homey
- Homogenous vs. homogeneous
I
- Idea vs. ideal
- Illegible vs. unreadable
- Immunity vs. impunity
- Impassive vs. passive
- Impending vs. pending
- Imperious vs. impervious
- Impinge vs. infringe
- Imply vs. infer
- Impugn vs. impute
- Incomparable vs. uncomparable
- Incredible vs. incredulous
- Inequality vs. inequity
- Infect vs. infest
- Ingenious vs. ingenuous
- Instantly vs. instantaneously
- Interment vs. internment
J
- Junction vs. juncture
L
- Laudable vs. laudatory
- Lay and lie
- Lend vs. loan
- Libel vs. slander
- Lightening vs. lightning
- Literally vs. figuratively
- Luxuriant vs. luxurious
M
- Magnate vs. magnet
- Maleficent vs. malevolent
- Marinade vs. marinate
- Masterful, masterly
- Materiel vs. material
- Maul vs. mull
- Mediator vs. moderator
- Monkey vs. ape
- Moot vs. mute
O
- Observance vs. observation
- Obsolescent vs. obsolete
- Oppress, repress, suppress
- Oral vs. verbal
- Ordinance vs. ordnance
- Overtones vs. undertones
P
- Paramount vs. tantamount
- Parricide vs. patricide
- Passed vs. past
- Penal vs. penile
- Periodic vs. periodical
- Perquisite vs. prerequisite
- Persecute vs. prosecute
- Picaresque vs. picturesque
- Pincer vs. pincher
- Point of view, standpoint, and viewpoint
- Polemic, polemical
- Polygamy, polygyny, polyandry
- Populous, populace, and population
- Portend, portent
- Practical vs. practicable
- Precede vs. proceed
- Preposition vs. proposition
- Presumptive vs. presumptuous
- Preventative vs. preventive
- Proportional vs. proportionate
- Prospective vs. perspective
- Prostate vs. prostrate
- Psych vs. psyche
- Psychiatry vs. psychology
- Purposely vs. purposefully
Q
- Qualitative and quantitative
- Quash vs. squash
R
- Ravaging vs. ravishing
- Re-create vs. recreate
- Reactionary and reactive
- Regard vs. regards
- Regime vs. regimen
- Regrettable vs. regretful
- Remunerate vs. renumerate
- Repel vs. repulse
- Rife vs. ripe
- Riff vs. rift
- Rogue vs. rouge
S
- Secede vs. succeed
- Secret vs. secretive
- Sensual vs. sensuous
- Shelf vs. shelve
- Silicon vs. silicone
- Spur vs. spurn
- Stained glass or stain glass?
- Stalactite and stalagmite
- Stanch vs. staunch
- Subconscious vs. unconscious
- Substantial vs. substantive
- Swath vs. swathe
- Systematic vs. systemic
T
- Tack vs. tact
- Telegram vs. telegraph
- Tenant vs. tenet
- Timber vs. timbre
- Tolerance vs. toleration
- Topography vs. typography
- Torturous vs. tortuous
- Toxicology vs. toxology
- Translucent vs. transparent
- Trawl vs. troll
- Turbid, turgid, torpid
- Turtle, tortoise, and terrapin
U
- Upmost vs. utmost
- Usage vs. use
V
- Vagina vs. vulva
- Vapid vs. vacuous
- Vertex vs. vortex
- Vicious vs. viscous
W
- Wanton vs. wonton
- Warrantee vs. warranty
- Wary vs. weary
- Whiny, whiney, whinny, Whinney
- Wreath vs. wreathe
Y
- Yoke vs. yolk