leak vs urination

leak and urination both are nouns.

Word	Noun	Adjective	Verb	Adverb
leak	Yes	No	Yes	No
urination	Yes	No	No	No

As nouns, urination is a hypernym of leak; that is, urination is a word with a broader meaning than leak:

Other hypernyms of leak include micturition.

leak (noun)	urination (noun)
unauthorized (especially deliberate) disclosure of confidential information	the discharge of urine
the discharge of a fluid from some container
an accidental hole that allows something (fluid or light etc.) to enter or escape
a euphemism for urination
soft watery rot in fruits and vegetables caused by fungi

leak (verb)	urination (verb)
have an opening that allows light or substances to enter or go out
enter or escape as through a hole or crack or fissure
tell anonymously
be leaked