leisure time vs leisure

leisure time and leisure both are nouns.

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

As nouns, leisure time and leisure are synonyms defined as:

leisure time (noun)	leisure (noun)
time available for ease and relaxation	freedom to choose a pastime or enjoyable activity
	time available for ease and relaxation