erythema vs love bite

erythema and love bite both are nouns.

Word	Noun	Adjective	Verb	Adverb
erythema	Yes	No	No	No
love bite	Yes	No	No	No

As nouns, love bite is a hyponym of erythema; that is, love bite is a word with a more specific, narrower meaning than erythema:

erythema: abnormal redness of the skin resulting from dilation of blood vessels (as in sunburn or inflammation)
love bite: a temporary red mark on a person's skin resulting from kissing or sucking by their lover

Other hyponyms of erythema include erythema multiforme, erythema nodosum, hickey, erythema solare, sunburn, windburn.

erythema (noun)	love bite (noun)
abnormal redness of the skin resulting from dilation of blood vessels (as in sunburn or inflammation)	a temporary red mark on a person's skin resulting from kissing or sucking by their lover