pull up vs straighten

pull up and straighten both are verbs.

Word	Noun	Adjective	Verb	Adverb
pull up	No	No	Yes	No
straighten	No	No	Yes	No

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

pull up (verb)	straighten (verb)
remove, usually with some force or effort; also used in an abstract sense	put (things or places) in order
cause (a vehicle) to stop	make straight or straighter
come to a halt after driving somewhere	make straight
straighten oneself	straighten by unrolling
	straighten up or out; make straight
	get up from a sitting or slouching position