Principle (noun): A fundamental truth or proposition serving as the foundation for belief or action.
Principal (noun/adjective): The head of a school; main or most important.
Example: “She always follows her principles.” / “The principal of the school is retiring.”

Stationary (adjective): Not moving.
Stationery (noun): Writing materials, such as paper and envelopes.
Example: “The car remained stationary at the traffic light.” / “She bought beautiful stationery.”

Advise (verb): To give recommendations or suggestions.
Advice (noun): Recommendations or suggestions given.
Example: “I advise you to study harder.” / “She gave me good advice.”

Imply (verb): To suggest something indirectly.
Infer (verb): To deduce information from evidence and reasoning.
Example: “Her tone implied that she was upset.” / “I inferred from his expression that he was unhappy.”

Elicit (verb): To evoke or draw out a response.
Illicit (adjective): Forbidden by law or rules.
Example: “The teacher’s question elicited many responses.” / “He was involved in illicit activities.”

Respectfully (adverb): With deference and respect.
Respectively (adverb): In the order already mentioned.
Example: “She listened respectfully.” / “Alice and Bob were given prizes, respectively.”

Precede (verb): To come before something in time, order, or position.
Proceed (verb): To go forward or continue.
Example: “The meeting will precede the lunch.” / “Please proceed with your presentation.”

Eminent (adjective): Famous and respected.
Imminent (adjective): About to happen.
Example: “He is an eminent scientist.” / “The storm is imminent.”

Allusion (noun): An indirect reference.
Illusion (noun): A false idea or deceptive appearance.
Example: “The novel’s title is an allusion to Shakespeare.” / “The magician created an illusion.”

Complaisant (adjective): Willing to please others.
Complacent (adjective): Self-satisfied and unaware of actual dangers.
Example: “She was complaisant to her boss’s demands.” / “He was complacent after his initial success.”