urging vs spur

urging and spur both are nouns.

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

As nouns, urging and spur are synonyms defined as:

urging and spur: a verbalization that encourages you to attempt something

Other synonyms of urging include goad, goading, prod, prodding, spurring.

urging (noun)	spur (noun)
the act of earnestly supporting or encouraging	a sharp prod fixed to a rider's heel and used to urge a horse onward
a verbalization that encourages you to attempt something	a railway line connected to a trunk line
insistent solicitation and entreaty	a verbalization that encourages you to attempt something
	tubular extension at the base of the corolla in some flowers
	any sharply pointed projection