principal ~ principle
[‘principal’ rhymes with ‘principle’]

educational institute principal
“Principal”, for the right pronunciation, please click here,
as an adjective: it means ‘chief, main; of high rank’; as a noun: it is ‘the title of the head of an educational institution such as a college or school; the sum of money lent or borrowed in a business’,

school principal
e.g.
The principal food in some parts of the world is wheat. [= main food — adjective]
The new principal has such a pleasing personality that every student in our school likes him very much. [= head of the school — noun]
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“Principle” (noun; for the right pronunciation, please click here) is ‘a general truth or law of nature that causes effect or that is used as a base; the rule or belief used by a person in conducting himself; a law of nature discovered’,
e.g.
A ship builder must be thorough with all the principles of navigation.
My teacher lives by the principles set by himself; you can’t make him tell a lie, even for fun!
Every student at school level is taught Archimedes’ Principle: “The buoyant force of a body is equal to the weight of the water displaced by it.”
