A Small Handful of Available, Long, One-Word Names
Unmitigable - Unable to mitigated; cannot be reduced
Esotericism - Oddity, beliefs and ideals outside of the orthdox
Asthenosphere - Upper layer of Earth's mantle, contains flow of super hot materials
Needling - Prodding at something as with a needle
Germinate - Begin to grow; come into existence and develop
Just a small few. Whether or not they're "OG" is up to you.