Common Words:
* Semiannual: Occurring twice a year.
* Semicircle: Half of a circle.
* Semifinal: A round of competition before the final round.
* Semicolon: A punctuation mark used to separate clauses.
* Semiprecious: A type of gemstone that is not as valuable as a precious stone.
* Semitransparent: Allowing some light to pass through but not completely clear.
* Semiautomatic: Operating partly automatically and partly manually.
Less Common Words:
* Semiconscious: Partially conscious.
* Semidisposable: Partially reusable.
* Semipermanent: Lasting for a limited but extended period.
* Semiretired: Partially retired from work.
* Semivowel: A sound that is halfway between a vowel and a consonant.
* Semitropical: Having a climate that is partly tropical.
* Semiblind: Partially blind.
* Semidetached: Partially detached from another structure.
Words in Specific Fields:
* Semi-trailer: A trailer that rests on its own axles but is partially supported by a tractor unit. (Transportation)
* Semi-solid: A substance that has properties of both a solid and a liquid. (Chemistry)
* Semi-interquartile range: A statistical measure of dispersion. (Statistics)
This list isn't exhaustive, but it gives you a good starting point!