As nouns the difference between atrocity and calamity

is that atrocity is  The quality or state of being atrocious; enormous wickedness; extreme criminality or cruelty while calamity is an event resulting in great loss.

As an adjective competitive

is .

As a verb challenge is

.

As a verb explode

is to destroy with an explosion.

As a noun explosives is

.

As a verb explode

is to destroy with an explosion.

As a noun explosions is

.

As a proper noun excellence

is a title of honor or respect; more common in the form excellency.

As an adjective consistent is

of a regularly occurring, dependable nature.

As a noun consistent is

(in the plural|rare) objects or facts that are coexistent, or in agreement with one another.

As nouns the difference between sunflower and safflower

is that sunflower is any plant of the genus helianthus , so called probably from the form and color of its floral head, having the form of a large disk surrounded by yellow ray flowers while safflower is (botany) a cultivated thistle-like plant, carthamus tinctorius , family asteraceae, now grown mainly for its oil.

As adjectives the difference between consistent and selfless

is that consistent is of a regularly occurring, dependable nature while selfless is having, exhibiting or motivated by no concern for oneself but for others; unselfish.

As a noun consistent

is (in the plural|rare) objects or facts that are coexistent, or in agreement with one another.

As nouns the difference between humdinger and doozie

is that humdinger is something that is particularly outstanding, unusual, or exceptional while doozie is (us) something that is extraordinary often used in the context of troublesome, difficult or problematic, but can be used positively as well.

As nouns the difference between mass and ammas

is that mass is march while ammas is .

As an adjective obligatory

is imposing obligation, morally or legally; binding.

As a noun force is

force.