buy into vs commit

buy into and commit both are verbs.

Word	Noun	Adjective	Verb	Adverb
buy into	No	No	Yes	No
commit	No	No	Yes	No

As verbs, commit is a hypernym of buy into; that is, commit is a word with a broader meaning than buy into:

Other hypernyms of buy into include invest, place, put.

buy into (verb)	commit (verb)
buy stocks or shares of a company	make a set of changes permanent
	transfer to another place so something can be kept or preserved
	give entirely to a specific person, activity, or cause
	confer a trust upon
	cause to be admitted; of persons to an institution
	make an investment
	perform an act, usually with a negative connotation
	engage in or perform