pastime vs recreation

pastime and recreation both are nouns.

Word	Noun	Adjective	Verb	Adverb
pastime	Yes	No	No	No
recreation	Yes	No	No	No

As nouns, recreation is a hypernym of pastime; that is, recreation is a word with a broader meaning than pastime:

pastime: a diversion that occupies one's time and thoughts (usually pleasantly)
recreation: an activity that diverts or amuses or stimulates

Other hypernyms of pastime include diversion.

pastime (noun)	recreation (noun)
a diversion that occupies one's time and thoughts (usually pleasantly)	an activity that diverts or amuses or stimulates
	activity that refreshes and recreates; activity that renews your health and spirits by enjoyment and relaxation