Glossary of Usage: Index of Commonly Confused Words

commonly confused words
When proofreading, you can't depend on your spellchecker to recognize the differences between commonly confused words. (Getty Images)

"Advice" or "advise"? "Farther" or "further"? "Principal" or "principle"? It's easy to confuse words that are similar in sound, spelling, or meaning. But with a bit of review it's also easy to clear up such confusions.

Here in our Glossary of Usage you'll find more than 300 sets of commonly confused words — with links to definitions, examples, usage notes, and practice exercises that should help you keep these words straight.

You can test your understanding of these words at our Review Quiz: Commonly Confused Words and Quiz on 20 Commonly Confused Words.

A

B

C

D

E

F

G

H

I

J

K

L

M

N

O

  • Obsolescent and Obsolete
  • Official and Officious
  • Oral and Verbal
  • Ordinance and Ordnance

P

Q

R

S

T

U

V

W

Y

Review:
Test your understanding of these words at our Review Quiz: Commonly Confused Words and Quiz on 20 Commonly Confused Words.