Synonyms for Endemic:

adj.

earliest (adjective)
autochthonous.
epidemic (adjective)
prevailing.
inhabiting (adjective)
aboriginal, indigenous, lodging, Occupying, native, Residing, dwelling, Inhabiting, domestic.

n.

numerous, rife, diffuse, be everywhere, prevalent, prolific, common, predominant, prevailing, Familiar. endemic (noun)
autochthonic, autochthonal, autochthonous, endemic disease, indigenous, native.
state (noun)
endemic disease.

Other synonyms:

adj.
aboriginal, autochthonal, autochthonic, indigenous, native.