purge vs excrete

purge is a noun but excrete is not a noun.

Word	Noun	Adjective	Verb	Adverb
purge	Yes	No	Yes	No
excrete	No	No	Yes	No

As verbs, excrete is a hypernym of purge; that is, excrete is a word with a broader meaning than purge:

Other hypernyms of purge include egest, eliminate, pass.

purge (noun)	excrete (noun)
an act of removing by cleansing; ridding of sediment or other undesired elements
the act of clearing yourself (or another) from some stigma or charge
an abrupt or sudden removal of a person or group from an organization or place

purge (verb)	excrete (verb)
excrete or evacuate (someone's bowels or body)	eliminate from the body
eject the contents of the stomach through the mouth
rid of impurities
rinse, clean, or empty with a liquid
make pure or free from sin or guilt
clear of a charge
oust politically