pruner vs pruning saw

pruner and pruning saw both are nouns.

Word	Noun	Adjective	Verb	Adverb
pruner	Yes	No	No	No
pruning saw	Yes	No	No	No

As nouns, pruning saw is a hypernym of pruner; that is, pruning saw is a word with a broader meaning than pruner:

pruner: a long-handled pruning saw with a curved blade at the end and sometimes a clipper; used to prune small trees
pruning saw: a handsaw used for pruning trees

pruner (noun)	pruning saw (noun)
a long-handled pruning saw with a curved blade at the end and sometimes a clipper; used to prune small trees	a handsaw used for pruning trees
a worker who thins out and trims trees and shrubs