Conversation so far:
what are the ranks in the hereditary peer?
The ranks in the United Kingdom are, in descending order of rank, duke, marquess, earl, viscount and baron; the female equivalents are duchess, marchioness, countess, viscountess and baroness.
How else are the ranks in the hereditary peer ranked besides in descending order of rank: duke,duchess, marquess, marchioness, earl, countess. viscount, viscountess and baron, baroness?
Baronets and baronetesses may pass on their titles, but are not peers. A non-hereditary title may belong to the peerage. Peerages may be created by means of letters patent.

Question: What do they do with their rankage?
Self-contained rewrite: What do hereditary peers do with their rankage?