soup up vs modify

soup up and modify both are verbs.

Word	Noun	Adjective	Verb	Adverb
soup up	No	No	Yes	No
modify	No	No	Yes	No

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

soup up (verb)	modify (verb)
make more powerful	make less severe or harsh or extreme
	add a modifier to a constituent
	cause to change; make different; cause a transformation