projection vs spur

projection and spur both are nouns.

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

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

projection (noun)	spur (noun)
the act of expelling or projecting or ejecting	a sharp prod fixed to a rider's heel and used to urge a horse onward
the act of projecting out from something	a railway line connected to a trunk line
any structure that branches out from a central support	a verbalization that encourages you to attempt something
the representation of a figure or solid on a plane as it would look from a particular direction	tubular extension at the base of the corolla in some flowers
a planned undertaking	any sharply pointed projection
a prediction made by extrapolating from past observations
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