free-liver vs free agent

free-liver and free agent both are nouns.

Word	Noun	Adjective	Verb	Adverb
free-liver	Yes	No	No	No
free agent	Yes	No	No	No

As nouns, free agent is a hypernym of free-liver; that is, free agent is a word with a broader meaning than free-liver:

free-liver: someone who gratifies physical appetites (especially for food and drink) with more than the usual freedom
free agent: someone acting freely or even irresponsibly

Other hypernyms of free-liver include free spirit, freewheeler.

free-liver (noun)	free agent (noun)
someone who gratifies physical appetites (especially for food and drink) with more than the usual freedom	someone acting freely or even irresponsibly
	(sports) a professional athlete who is free to sign a contract to play for any team