pruner vs trimmer

pruner and trimmer both are nouns.

Word	Noun	Adjective	Verb	Adverb
pruner	Yes	No	No	No
trimmer	Yes	No	No	No

As nouns, pruner and trimmer are synonyms defined as:

pruner (noun)	trimmer (noun)
a long-handled pruning saw with a curved blade at the end and sometimes a clipper; used to prune small trees	joist that receives the end of a header in floor or roof framing in order to leave an opening for a staircase or chimney etc.
a worker who thins out and trims trees and shrubs	capacitor having variable capacitance; used for making fine adjustments
	a machine that trims timber
	a worker who thins out and trims trees and shrubs