lupus erythematosus vs lupus

lupus erythematosus and lupus both are nouns.

Word	Noun	Adjective	Verb	Adverb
lupus erythematosus	Yes	No	No	No
lupus	Yes	No	No	No

As nouns, lupus is a hypernym of lupus erythematosus; that is, lupus is a word with a broader meaning than lupus erythematosus:

lupus erythematosus: a chronic inflammatory collagen disease affecting connective tissue (skin or joints)
lupus: any of several forms of ulcerative skin disease

Other hypernyms of lupus erythematosus include autoimmune disease, autoimmune disorder.

lupus erythematosus (noun)	lupus (noun)
a chronic inflammatory collagen disease affecting connective tissue (skin or joints)	any of several forms of ulcerative skin disease