As a verb adopt is

(with relationship specified) to take by choice into relationship, child, heir, friend, citizen, etc.

As a noun necessity is

the quality or state of being necessary, unavoidable, or absolutely requisite.

As nouns the difference between convergence and aggregation

is that convergence is the act of moving toward union or uniformity while aggregation is the act of collecting together (aggregating).

As nouns the difference between hospital and polyclinic

is that hospital is a building designed to diagnose and treat the sick, injured or dying. Usually has a staff of doctors and nurses to aid in the treatment of patients while polyclinic is a clinic in which diseases of many sorts are treated; especially, an institution in which clinical instruction is given in all kinds of disease.

As an adjective hospital

is hospitable.

As a verb hesitated

is (hesitate).

As an adjective reluctant is

opposing; offering resistance (to).

As nouns the difference between brochure and mal

is that brochure is a booklet of printed informational matter, like a pamphlet, often for promotional purposes while mal is rent.

As verbs the difference between unifying and unified

is that unifying is while unified is (unify).

As adjectives the difference between unifying and unified

is that unifying is tending to unify; promoting unity; uniting while unified is united into a whole.

As nouns the difference between antonym and positive

is that antonym is a word which has the opposite meaning of another, although not necessarily in all its senses while positive is a thing capable of being affirmed; something real or actual.

As an adjective positive is

formally laid down.

As a noun programmer is

one who writes computer programs; a software developer.

As verbs the difference between inform and explain

is that inform is to instruct, train (usually in matters of knowledge) while explain is to make plain, manifest, or intelligible; to clear of obscurity; to illustrate the meaning of.

As an adjective inform

is without regular form; shapeless; ugly; deformed.