excretion vs dirty joke

excretion and dirty joke both are nouns.

Word	Noun	Adjective	Verb	Adverb
excretion	Yes	No	No	No
dirty joke	Yes	No	No	No

excretion (noun)	dirty joke (noun)
the bodily process of discharging waste matter	an indelicate joke
waste matter (as urine or sweat but especially feces) discharged from the body