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