relaxation vs leisure

relaxation and leisure both are nouns.

Word	Noun	Adjective	Verb	Adverb
relaxation	Yes	No	No	No
leisure	Yes	No	No	No

As nouns, leisure is a hyponym of relaxation; that is, leisure is a word with a more specific, narrower meaning than relaxation:

Other hyponyms of relaxation include bed rest, bedrest, laziness, lie-in, dormancy, quiescence, quiescency, sleeping.

relaxation (noun)	leisure (noun)
freedom from activity (work or strain or responsibility)	freedom to choose a pastime or enjoyable activity
the act of making less strict	time available for ease and relaxation
a method of solving simultaneous equations by guessing a solution and then reducing the errors that result by successive approximations until all the errors are less than some specified amount
an occurrence of control or strength weakening
a feeling of refreshing tranquility and an absence of tension or worry
(physics) the exponential return of a system to equilibrium after a disturbance
(physiology) the gradual lengthening of inactive muscle or muscle fibers