Proprietorship rhymes with:
conservatorship, editorship, conservatorship, dictatorship, directorship, distributorship, editorship, ambassadorship, authorship, censorship, conservatorship, dealership, dictatorship, directorship, distributorship, editorship, governorship, homeownership, leadership, membership, ownership, partnership, professorship, readership, receivership, ridership, scholarship, speakership, sponsorship, viewership