adsorptive vs adsorbent

adsorptive is not a noun while adsorbent is a noun.

Word	Noun	Adjective	Verb	Adverb
adsorptive	No	Yes	No	No
adsorbent	Yes	Yes	No	No

As adjectives, adsorptive and adsorbent are synonyms defined as:

adsorptive and adsorbent: having capacity or tendency to adsorb or cause to accumulate on a surface

Other synonyms of adsorptive include surface-assimilative.

adsorptive (noun)	adsorbent (noun)
	a material having capacity or tendency to adsorb another substance

adsorptive (adjective)	adsorbent (adjective)
having capacity or tendency to adsorb or cause to accumulate on a surface	having capacity or tendency to adsorb or cause to accumulate on a surface