The purpose of the OGL is to declare what third parties can use. Everything declared as open content for the OGL is usable "as is".
Some publishers have been criticized in the past for "crippled OGL" declarations because they basically kept the full text of Feats and the like closed instead of open when other content was open.
Paizo makes just about all rules content open... only some names that use proprietary names (such as Golarion countries, deities, NPCs, and such) are closed, and need to be re-named.
Terms like "Feat" and such.. I am not sure they can individually be protected. The overall stat-block format CAN be, but that would not affect the names of categories. If you're really concerned, consult a lawyer about it.
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