free-liver vs free spirit

free-liver and free spirit both are nouns.

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

As nouns, free spirit is a hypernym of free-liver; that is, free spirit 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 spirit: someone acting freely or even irresponsibly

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

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