thicken vs alter

thicken and alter both are verbs.

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

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

Other hypernyms of thicken include change, modify.

thicken (verb)	alter (verb)
become thick or thicker	remove the ovaries of
make thick or thicker	become different in some particular way, without permanently losing one's or its former characteristics or essence
make viscous or dense	cause to change; make different; cause a transformation
	insert words into texts, often falsifying it thereby
	make an alteration to