bestiality vs sex activity

bestiality and sex activity both are nouns.

Word	Noun	Adjective	Verb	Adverb
bestiality	Yes	No	No	No
sex activity	Yes	No	No	No

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

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

bestiality (noun)	sex activity (noun)
sexual activity between a person and an animal	activities associated with sexual intercourse
the stupid brutal quality of a beast