bondage vs sexual activity

bondage and sexual activity both are nouns.

Word	Noun	Adjective	Verb	Adverb
bondage	Yes	No	No	No
sexual activity	Yes	No	No	No

As nouns, sexual activity is a hypernym of bondage; that is, sexual activity is a word with a broader meaning than bondage:

bondage: sexual practice that involves physically restraining (by cords or handcuffs) one of the partners
sexual activity: activities associated with sexual intercourse

Other hypernyms of bondage include sex, sex activity, sexual practice.

bondage (noun)	sexual activity (noun)
sexual practice that involves physically restraining (by cords or handcuffs) one of the partners	activities associated with sexual intercourse
the state of being under the control of another person
the state of being under the control of a force or influence or abstract power