The second element of hate-rede is Middle English -rede / -reden; this is morphological decomposition, not whole-word sound change.
CANONICAL RELATIONSHIP RECORD
COVERAGE LEDGER ↗A CLAIM
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A relationship—not a generated explanation. Both endpoints, every editorial field, every citation, and every dossier reuse are preserved below.
hatrede / hatreden / hateredyn
hatred; the state or condition of hate
OPEN NODE 1091 ↗-rede / -reden
a state, condition, quality, status, estimation, rule, or relation to X
OPEN NODE 1098 ↗THE COMPLETE RELATIONSHIP
EVERY FIELD, NOT A FAIRY TALE
The condition or state suffix turns hate into the state or condition of hate.
Middle English compound analysis.
Merriam-Webster Editors · American Heritage Dictionary Editors · Elizabeth Closs Traugott
established — The dictionaries directly segment the word and Traugott places it in the X-RÆDEN schema.
reviewed
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Places the word inside the wider condition construction.
Directly segments the second component and defines it as state or quality.
Independently identifies the component.
EDITORIAL REUSE