solemnize vs alter

solemnize and alter both are verbs.

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

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

Other hypernyms of solemnize include change, modify.

solemnize (verb)	alter (verb)
make solemn and grave	remove the ovaries of
observe or perform with dignity or gravity	become different in some particular way, without permanently losing one's or its former characteristics or essence
perform (the wedding ceremony) with proper ceremonies	cause to change; make different; cause a transformation
	insert words into texts, often falsifying it thereby
	make an alteration to