different between nerdism vs nerdish

English

nerd +? -ism

nerdism (countable and uncountable, plural nerdisms)

(informal) The practices or behaviours of nerds; nerdiness.
- 2002, Lori Kendall, Hanging Out in the Virtual Pub (page 87)
  Nerdism in both men and women is held to decrease sexual attractiveness, but in men this is compensated by the relatively masculine values attached to intelligence and computer skills.

nerd +? -ish

nerdish (comparative more nerdish, superlative most nerdish)

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