tie up vs obstruct

tie up and obstruct both are verbs.

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

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

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

tie up (verb)	obstruct (verb)
secure with or as if with ropes	block passage through
finish the last row	shut out from view or get in the way so as to hide from sight
restrain from moving or operating normally	hinder or prevent the progress or accomplishment of
secure in or as if in a berth or dock
invest so as to make unavailable for other purposes