vulgarise vs alter

vulgarise and alter both are verbs.

Word	Noun	Adjective	Verb	Adverb
vulgarise	No	No	Yes	No
alter	No	No	Yes	No

As verbs, alter is a hypernym of vulgarise; that is, alter is a word with a broader meaning than vulgarise:

Other hypernyms of vulgarise include change, modify.

vulgarise (verb)	alter (verb)
act in a vulgar manner	remove the ovaries of
debase and make vulgar	become different in some particular way, without permanently losing one's or its former characteristics or essence
cater to popular taste to make popular and present to the general public; bring into general or common use	cause to change; make different; cause a transformation
	insert words into texts, often falsifying it thereby
	make an alteration to