security vs earnest

security and earnest both are nouns.

Word	Noun	Adjective	Verb	Adverb
security	Yes	No	No	No
earnest	Yes	Yes	No	No

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

security: property that your creditor can claim in case you default on your obligation
earnest: something of value given by one person to another to bind a contract

Other hyponyms of security include deposit, recognisance, recognizance, stock-purchase warrant, stock warrant, warrant.

security (noun)	earnest (noun)
measures taken as a precaution against theft or espionage or sabotage etc.	something of value given by one person to another to bind a contract
an electrical device that sets off an alarm when someone tries to break in
a guarantee that an obligation will be met
freedom from anxiety or fear
a department responsible for the security of the institution's property and workers
property that your creditor can claim in case you default on your obligation
defense against financial failure; financial independence
a formal declaration that documents a fact of relevance to finance and investment; the holder has a right to receive interest or dividends
the state of being free from danger or injury

security (adjective)	earnest (adjective)
	not distracted by anything unrelated to the goal
	characterized by a firm and humorless belief in the validity of your opinions
	sincerely earnest