is a specific kind of: organic compound.

is a broader term that covers: alanine | asparagine | aspartic acid | canavanine | citrulline | cysteine | cystine | dihydroxyphenylalanine, dopa | essential amino acid | GABA, gamma aminobutyric acid | glutamic acid, glutaminic acid | glutamine | glycine | hydroxyproline | iodoamino acid | ornithine | proline | creatin, creatine | sarcosine | serine | thyronine | tyramine | tyrosine ... show more.

is contained in: protein.