proline vs amino acid

proline and amino acid both are nouns.

Word	Noun	Adjective	Verb	Adverb
proline	Yes	No	No	No
amino acid	Yes	No	No	No

As nouns, amino acid is a hypernym of proline; that is, amino acid is a word with a broader meaning than proline:

proline: an amino acid that is found in many proteins (especially collagen)
amino acid: organic compounds containing an amino group and a carboxylic acid group

Other hypernyms of proline include aminoalkanoic acid.

proline (noun)	amino acid (noun)
an amino acid that is found in many proteins (especially collagen)	organic compounds containing an amino group and a carboxylic acid group