projection vs limb

projection and limb both are nouns.

Word	Noun	Adjective	Verb	Adverb
projection	Yes	No	No	No
limb	Yes	No	No	No

As nouns, limb is a hyponym of projection; that is, limb is a word with a more specific, narrower meaning than projection:

projection (noun)	limb (noun)
the act of expelling or projecting or ejecting	any projection that is thought to resemble a human arm
the act of projecting out from something	the graduated arc that is attached to an instrument for measuring angles
any structure that branches out from a central support	either of the two halves of a bow from handle to tip
the representation of a figure or solid on a plane as it would look from a particular direction	one of the jointed appendages of an animal used for locomotion or grasping: arm, leg, wing, flipper
a planned undertaking	(astronomy) the circumferential edge of the apparent disc of the sun or the moon or a planet
a prediction made by extrapolating from past observations	any of the main branches arising from the trunk or a bough of a tree
the projection of an image from a film onto a screen
the acoustic phenomenon that gives sound a penetrating quality
(psychiatry) a defense mechanism by which your own traits and emotions are attributed to someone else
any solid convex shape that juts out from something