excretion vs blue joke

excretion and blue joke both are nouns.

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

excretion (noun)	blue 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