solicitation vs urging

solicitation and urging both are nouns.

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

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

Other hyponyms of solicitation include beggary, begging, mendicancy, touch, importunity, urgency.

solicitation (noun)	urging (noun)
the act of enticing a person to do something wrong (as an offer of sex in return for money)	the act of earnestly supporting or encouraging
an entreaty addressed to someone of superior status	a verbalization that encourages you to attempt something
request for a sum of money	insistent solicitation and entreaty