noun
nerd
NERD/nɜːrd/
A person deeply absorbed in a specialized interest, often seen as intellectual or socially awkward.
The electronics nerd studies the circuit board with absorbed attention.

Etymology
Nerd began as student slang for a socially awkward person, later overlapping with geek for studious or technology-focused people. It probably comes from slang nert, “stupid or crazy person,” but that ancestry is uncertain.
In context
I would definitely call myself a decomposition nerd
More examples
- She proudly calls herself a history nerd.
- Several science nerds formed a weekend club.
- He disliked being dismissed as a nerd because he loved mathematics.
Forms
nerd · nerds
Similar words
- enthusiast
- Focuses on strong interest without implying awkwardness.
- geek
- Geek is similarly informal and often emphasizes technical or specialized interests.