Conclusion:
* Noun: This is the most common usage. It refers to the final part of something, often a summary or a decision.
* Verb: It can be used as a verb meaning "to bring something to an end," or "to decide something after considering the facts."
Examples:
* Noun: "The *conclusion* of the book was bittersweet."
* Verb: "We *concluded* that the experiment was a success."
Correction:
* Noun: This is also the most common usage. It refers to the act of setting something right or making an amendment.
* Verb: It can be used as a verb meaning "to set something right" or "to make an amendment."
Examples:
* Noun: "The teacher made a *correction* to the student's essay."
* Verb: "Please *correct* the mistake in your calculations."
In short:
* Conclusion: Typically a noun, but can be a verb.
* Correction: Typically a noun, but can be a verb.