tumbling vs gymnastics

tumbling and gymnastics both are nouns.

Word	Noun	Adjective	Verb	Adverb
tumbling	Yes	No	No	No
gymnastics	Yes	No	No	No

As nouns, gymnastics is a hypernym of tumbling; that is, gymnastics is a word with a broader meaning than tumbling:

tumbling: the gymnastic moves of an acrobat
gymnastics: a sport that involves exercises intended to display strength and balance and agility

Other hypernyms of tumbling include gymnastic exercise.

tumbling (noun)	gymnastics (noun)
the gymnastic moves of an acrobat	a sport that involves exercises intended to display strength and balance and agility