bastardise vs pervert

bastardise is not a noun while pervert is a noun.

Word	Noun	Adjective	Verb	Adverb
bastardise	No	No	Yes	No
pervert	Yes	No	Yes	No

As verbs, pervert is a hypernym of bastardise; that is, pervert is a word with a broader meaning than bastardise:

bastardise: change something so that its value declines; for example, art forms
pervert: corrupt morally or by intemperance or sensuality

Other hypernyms of bastardise include corrupt, debase, debauch, demoralise, demoralize, deprave, misdirect, profane, subvert, vitiate.

bastardise (noun)	pervert (noun)
	a person whose behavior deviates from what is acceptable especially in sexual behavior

bastardise (verb)	pervert (verb)
declare a child to be illegitimate	change the inherent purpose or function of something
change something so that its value declines; for example, art forms	practice sophistry; change the meaning of or be vague about in order to mislead or deceive
	corrupt morally or by intemperance or sensuality