select vs sift

select is an adjective but sift is not an adjective.

Word	Noun	Adjective	Verb	Adverb
select	No	Yes	Yes	No
sift	No	No	Yes	No

As verbs, sift is a hyponym of select; that is, sift is a word with a more specific, narrower meaning than select:

select (adjective)	sift (adjective)
selected or chosen for special qualifications
of superior grade

select (verb)	sift (verb)
pick out, select, or choose from a number of alternatives	distinguish and separate out
	separate by passing through a sieve or other straining device to separate out coarser elements
	check and sort carefully
	move as if through a sieve