visualise vs alter

visualise and alter both are verbs.

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

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

Other hypernyms of visualise include change, modify.

visualise (verb)	alter (verb)
make visible	remove the ovaries of
imagine; conceive of; see in one's mind	become different in some particular way, without permanently losing one's or its former characteristics or essence
form a mental picture of something that is invisible or abstract	cause to change; make different; cause a transformation
view the outline of by means of an X-ray	insert words into texts, often falsifying it thereby
	make an alteration to