secateurs vs pruning shears

secateurs and pruning shears both are nouns.

Word	Noun	Adjective	Verb	Adverb
secateurs	Yes	No	No	No
pruning shears	Yes	No	No	No

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

secateurs: small pruning shears with a spring that holds the handles open and a single blade that closes against a flat surface
pruning shears: shears with strong blades used for light pruning of woody plants

secateurs (noun)	pruning shears (noun)
small pruning shears with a spring that holds the handles open and a single blade that closes against a flat surface	shears with strong blades used for light pruning of woody plants