amylase vs ptyalin

amylase and ptyalin both are nouns.

Word	Noun	Adjective	Verb	Adverb
amylase	Yes	No	No	No
ptyalin	Yes	No	No	No

As nouns, ptyalin is a hyponym of amylase; that is, ptyalin is a word with a more specific, narrower meaning than amylase:

amylase: any of a group of proteins found in saliva and pancreatic juice and parts of plants; help convert starch to sugar
ptyalin: an amylase secreted in saliva

amylase (noun)	ptyalin (noun)
any of a group of proteins found in saliva and pancreatic juice and parts of plants; help convert starch to sugar	an amylase secreted in saliva