Dictionary.com
Thesaurus.com

glutamate vs. glutamic acid

[gloo-tuh-meyt] / ˈglu təˌmeɪt /

noun

  1. a salt or ester of glutamic acid.

[gloo-tam-ik] / gluˈtæm ɪk /
Also glutaminic acid

noun

Biochemistry.
  1. an amino acid, HOOCCH 2 CH 2 CH(NH2 )COOH, obtained by hydrolysis from wheat gluten and sugar-beet residues, used commercially chiefly in the form of its sodium salt to intensify the flavor of meat or other food. Glu; E