As adjectives the difference between formless and subtle

is that formless is without form; shapeless while subtle is hard to grasp; not obvious or easily understood; barely noticeable.

As nouns the difference between prepositions and complementizer

is that prepositions is plural of lang=en while complementizer is a form of subordinate conjunction.

As a verb prepositions

is third-person singular of preposition.

As adjectives the difference between qualified and recognized

is that qualified is meeting the standards, requirements, and training for a position while recognized is notable; distinguished; honored.

As verbs the difference between qualified and recognized

is that qualified is (qualify) while recognized is (recognize).

In chemistry terms the difference between emulsion and surfactant

is that emulsion is a colloid in which both phases are liquid while surfactant is a surface active agent, or wetting agent, capable of reducing the surface tension of a liquid; typically organic compounds having a hydrophilic "head" and a hydrophobic "tail".

As nouns the difference between emulsion and surfactant

is that emulsion is a stable suspension of small droplets of one liquid in another with which it is immiscible while surfactant is a surface active agent, or wetting agent, capable of reducing the surface tension of a liquid; typically organic compounds having a hydrophilic "head" and a hydrophobic "tail".

As verbs the difference between boost and fostered

is that boost is to lift or push from behind (one who is endeavoring to climb); to push up; hence, to assist in overcoming obstacles, or in making advancement while fostered is past tense of foster.

As a noun boost

is a push from behind, as to one who is endeavoring to climb; help.

As adjectives the difference between voluptuous and extravagant

is that voluptuous is suggestive of or characterized by full, generous, pleasurable sensation while extravagant is exceeding the bounds of something; roving; hence, foreign.

As an adjective faulty

is having or displaying faults; not perfect; not adequate or acceptable.

As a noun mistake is

an error; a blunder.

As a verb mistake is

to understand wrongly, taking one thing for another, or someone for someone else.

As a conjunction if

is supposing that, assuming that, in the circumstances that; used to introduce a condition or choice.

As a noun if

is an uncertainty, possibility, condition, doubt etc.

As an initialism IF

is interactive fiction.

As a verb provide is

to make a living; earn money for necessities.