Words That Rhyme With "Catalyst's" :

3 syllables:

analyst's, battailous, fatalists, panelists, statolith, Tantalus

4 syllables:

adactylous, Annapolis, evangelists

5 syllables:

brachydactylous, leptodactylous, televangelists

6 syllables:

anisodactylous, heterodactylous