sieve out vs select

sieve out is not an adjective while select is an adjective.

Word	Noun	Adjective	Verb	Adverb
sieve out	No	No	Yes	No
select	No	Yes	Yes	No

As verbs, select is a hypernym of sieve out; that is, select is a word with a broader meaning than sieve out:

Other hypernyms of sieve out include choose, pick out, take.

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

sieve out (verb)	select (verb)
separate or remove	pick out, select, or choose from a number of alternatives