thinker (n.)
- authority
- brainworker
- casuist
- cosmologist
- dialectician
- doctor
- egghead
- elder
- expert
- guru
- highbrow
- intellect
- intellectual
- literate
- logician
- logistician
- mahatma
- mandarin
- master
- mastermind
- mentor
- oracle
- philosopher
- philosophizer
- pundit
- rabbi
- ratiocinator
- rationalist
- reasoner
- sage
- savant
- scholar
- seer
- sophist
- speculator
- starets
- syllogist
- syllogizer
