Client's rhymes with:
clients, clients', alliant's, clients, clients', alliant's, clients, clients', giant's, giants, giants', supergiants
Client's sounds like:
calamities, calamitous, calmat's, claimants, claimants', clematis, clemente's, clementes, clements, clementz, clients, clients', climates, climatic, clonts, clontz, coolants, culminates