Trimmer (noun)

1. A tool or device used to trim or shape something, such as hair, plants, or fabric.
2. A person or device that removes or adjusts excess or unwanted parts of something.

Origin:

Late 17th century (as a verb in the sense "prune, lop off"): from trim + -er.

Examples:

1. She used the hair trimmer to shape her beard.
2. The electric trimmer made quick work of the overgrown hedge.
3. He's a skilled trimmer and can trim any type of fabric.
4. The ship's trimmer helped balance the cargo.
5. She was an excellent trimmer, and her cakes were always perfectly shaped.