Akela, that's an eta (which can look like an h), but it's a long e. eta = [e-long:3dxp3aj6][/e-long:3dxp3aj6]; epsilon = [e-short:3dxp3aj6][/e-short:3dxp3aj6]; omicron = [o-short:3dxp3aj6][/o-short:3dxp3aj6]; omega = [o-long:3dxp3aj6][/o-long:3dxp3aj6].
I don't know if you would write it as catalyt[e-long:3dxp3aj6][/e-long:3dxp3aj6]s though.
The only word that Perseus has ending in -lytes is [o-long:3dxp3aj6][/o-long:3dxp3aj6]d[i-long:3dxp3aj6][/i-long:3dxp3aj6]nolytes, with an alternate spelling of: [o-long:3dxp3aj6][/o-long:3dxp3aj6]d[y-long:3dxp3aj6][/y-long:3dxp3aj6]nolytes. It's first declension (genitive -ae), masculine, "he who/that which alleviates the pangs of childbirth."
A *long* time ago, someone asked about 1st declension nouns ending in -as and -es. The ones usually listed in grammars are proper names like Aeneas and Anchises.