tie up vs impede

tie up and impede both are verbs.

Word	Noun	Adjective	Verb	Adverb
tie up	No	No	Yes	No
impede	No	No	Yes	No

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

Other hypernyms of tie up include block, close up, jam, obstruct, obturate, occlude.

tie up (verb)	impede (verb)
secure with or as if with ropes	block passage through
finish the last row	be a hindrance or obstacle to
restrain from moving or operating normally
secure in or as if in a berth or dock
invest so as to make unavailable for other purposes