assimilator,
learner,
scholar someone (especially a child) who learns (as from a teacher) or takes up knowledge or beliefs
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Wikipedia
Nerd is a term that refers to a person who avidly pursues intellectual activities, technical or scientific endeavors, esoteric knowledge, or other obscure interests, rather than engaging in more social or conventional activities. It often carries a derogatory connotation or stereotype. The nerd may be awkward, shy and unattractive.
OmegaWiki Dictionary
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nerd Someone who is socially inept and unstylish; especially someone who is highly devoted to intellectual or academic pursuits.
nerd An insignificant student who is ridiculed as being affected or boringly studious.
nerd An intelligent but single-minded expert in a particular technical field or profession.