principal, principle - vocabulary
Principal: the head of a school; also means “money” or “the balance on your mortgage.” As an adjective, principal means “main.”
Principle: acts only as a noun. It means “rule” or “moral tenet.”
Use this trick:
A principal should be your pal. Principle ends in -le. So does rule.
Example: According to the principal rule at Sunshine Elementary, you must obey the principal and respect the principles of democracy.
Note: You’ll find an extended discussion of principal and principle in Grammar.com’s section on Common Grammatical Mistakes. Click here for the beginning of that discussion.