In lang=en terms the difference between sustain and pertain

is that sustain is to confirm, prove, or corroborate while pertain is to relate, to refer, be relevant to.

As verbs the difference between sustain and pertain

is that sustain is to maintain, or keep in existence while pertain is to belong.

As a noun sustain

is (music) a mechanism which can be used to hold a note, as the right pedal on a piano.

As a noun held

is hero.

As a verb completed is

(complete).

As an adjective completed is

finished.

As nouns the difference between glamours and attraction

is that glamours is while attraction is the tendency to attract.

As nouns the difference between band and average

is that band is tape while average is (legal|marine) financial loss due to damage to transported goods; compensation for damage or loss.

As an adjective average is

(not comparable) constituting or relating to the average.

As a verb average is

(informal) to compute the arithmetic mean of.

As adverbs the difference between physically and practically

is that physically is in a physical manner while practically is in practice; in effect not necessarily officially the case but what actually occurs.

As an adjective rank

is heavy, serious, grievous.

As a verb prioritise is

.

As a noun mission

is mission (all senses).

As an adjective principal is

principal, main.

As nouns the difference between papilloma and fibroma

is that papilloma is (pathology|oncology) an epithelial tumour, usually benign, with the appearance of a papilla while fibroma is (pathology) a benign tumour of fibrous connective tissue.

As verbs the difference between bleed and cough

is that bleed is (of an animal) to lose blood through an injured blood vessel while cough is to push air from the lungs in a quick, noisy explosion.

As nouns the difference between bleed and cough

is that bleed is an incident of bleeding, as in haemophilia while cough is a sudden, usually noisy expulsion of air from the lungs, often involuntary.

As nouns the difference between aggressiveness and hostile

is that aggressiveness is (uncountable) the state or quality of being aggressive while hostile is (chiefly|in the plural) an enemy.

As an adjective hostile is

belonging or appropriate to an enemy; showing the disposition of an enemy; showing ill will and malevolence, or a desire to thwart and injure; occupied by an enemy or enemies; inimical; unfriendly.