Necrosis rhymes with:
fibrosis, nephrosis, neurosis, acidosis, apotheosis, arteriosclerosis, asbestosis, cirrhosis, diagnosis, fibrosis, heterosis, hypnosis, meiosis, misdiagnosis, nephrosis, neurosis, prognosis, psychosis, sclerosis, symbiosis, thrombosis
Necrosis sounds like:
nagorski, naysayers, nazer's, negroes, negros, neikirk, new-jersey, new-jersey's, newkirk, newswires, niagara's, nicaragua, nicaragua's, nigeria's, nigger's, niggers, nigris, nongreek, nosair's, nucor's