Potential answers for "One with deep knowledge of a subject"

⭐⭐⭐⭐ NERD
⭐⭐⭐ THIRSTER
⭐⭐⭐ INSIDER
⭐⭐⭐ MRKNOWITALL
⭐⭐⭐ POLYMATH
⭐⭐⭐ NUCLEARENGINEER
⭐⭐ ROPES
⭐⭐ STARTREK
⭐⭐ CODENAME
⭐⭐ INNIE

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