astir vs up

astir and up both are adjectives.

Word	Noun	Adjective	Verb	Adverb
astir	No	Yes	No	No
up	No	Yes	Yes	Yes

As adjectives, astir and up are synonyms defined as:

astir (adjective)	up (adjective)
on the move	being or moving higher in position or greater in some value; being above a former position or level
out of bed	extending or moving toward a higher place
	out of bed
	used up
	(used of computers) operating properly
	(usually followed by `on' or `for') in readiness
	open
	getting higher or more vigorous

astir (verb)	up (verb)
	raise

astir (adverb)	up (adverb)
	spatially or metaphorically from a lower to a higher position
	to a later time
	to a more central or a more northerly place
	nearer to the speaker
	to a higher intensity