词路径
- entity
- physical entity
- matter
- substance
- material
- stuff
- chemical
- chemical substance
- compound
- chemical compound
- organic compound
- neurochemical
- neurotransmitter
下位词
- Adrenalin
- GABA
- acetylcholine
- adrenaline
- epinephrin
- epinephrine
- gamma aminobutyric acid