macule vs liver spot

macule and liver spot both are nouns.

Word	Noun	Adjective	Verb	Adverb
macule	Yes	No	No	No
liver spot	Yes	No	No	No

As nouns, liver spot is a hyponym of macule; that is, liver spot is a word with a more specific, narrower meaning than macule:

macule: a patch of skin that is discolored but not usually elevated; caused by various diseases
liver spot: a type of skin disease that causes brown spots on the skin

Other hyponyms of macule include freckle, lentigo, plague spot.

macule (noun)	liver spot (noun)
a patch of skin that is discolored but not usually elevated; caused by various diseases	a type of skin disease that causes brown spots on the skin