expand vs modify

expand and modify both are verbs.

Word	Noun	Adjective	Verb	Adverb
expand	No	No	Yes	No
modify	No	No	Yes	No

As verbs, modify is a hypernym of expand; that is, modify is a word with a broader meaning than expand:

Other hypernyms of expand include alter, change.

expand (verb)	modify (verb)
grow vigorously	make less severe or harsh or extreme
exaggerate or make bigger	add a modifier to a constituent
become larger in size or volume or quantity	cause to change; make different; cause a transformation
expand the influence of
make bigger or wider in size, volume, or quantity
add details, as to an account or idea; clarify the meaning of and discourse in a learned way, usually in writing
extend in one or more directions