In English, there is a special category of words whose stress pattern is determined not by sound rhythm, but by meaning (semantics).

These words include:
1. Certain compound words
2. Words with distinct, meaningful prefixes (e.g., over-, under-, anti-, ex-, re-)

The Key Rule for Them:
In these words, two primary stresses are often used (e.g., well-known). This happens because both parts of the word carry equal semantic importance. The meaningful weight of each part "overrides" the usual rhythmic rules of stress placement.