blade vs rotating mechanism

blade and rotating mechanism both are nouns.

Word	Noun	Adjective	Verb	Adverb
blade	Yes	No	No	No
rotating mechanism	Yes	No	No	No

As nouns, rotating mechanism is a hypernym of blade; that is, rotating mechanism is a word with a broader meaning than blade:

blade (noun)	rotating mechanism (noun)
the flat part of a tool or weapon that (usually) has a cutting edge	a mechanism that rotates
a cutting or thrusting weapon that has a long metal blade and a hilt with a hand guard
flat surface that rotates and pushes against air or water
the part of the skate that slides on the ice
a broad flat body part (as of the shoulder or tongue)
a cut of beef from the shoulder blade
something long and thin resembling a blade of grass
a dashing young man
especially a leaf of grass or the broad portion of a leaf as distinct from the petiole