ptyalin vs amylase

ptyalin and amylase both are nouns.

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

As nouns, amylase is a hypernym of ptyalin; that is, amylase is a word with a broader meaning than ptyalin:

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

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