Metastasis rhymes with:
dimitrius's, elephantiasis, ilalis's, microgenesys, molpus's, nemesis, organogenesis, parenthesis, photosynthesis, stephanopoulos's, telesis, urinalysis
Metastasis sounds like:
matsushita's, medicates, metastasize, midgets, midgett's, midwest's, mindsets, mitigates, mitsotakis, montesdeoca