As a verb challenges

is .

As a noun hardship is

(countable or uncountable) difficulty or trouble; hard times.

As an adjective false is

(label) one of two states of a boolean variable; logic.

As a noun anxiety

is an unpleasant state of mental uneasiness, nervousness, apprehension and obsession or concern about some uncertain event.

As an adjective false is

(label) one of two states of a boolean variable; logic.

As nouns the difference between addition and substraction

is that addition is addition while substraction is (obsolete) subtraction; deduction.

As a noun grab

is grave.

As a proper noun jean is

.

As a noun pickleball

is a racquet sport which combines elements of badminton, tennis, and table tennis.

As an adjective false is

(label) one of two states of a boolean variable; logic.

As nouns the difference between solecism and anachronism

is that solecism is erroneous or improper usage; absurdity while anachronism is a chronological mistake; the erroneous dating of an event, circumstance, or object.

As a verb misdated

is (misdate).

As a noun anachronism is

a chronological mistake; the erroneous dating of an event, circumstance, or object.

As verbs the difference between brisk and bustle

is that brisk is to make or become lively; to enliven; to animate while bustle is to move busily and energetically with fussiness (often followed by about ).

As an adjective brisk

is full of liveliness and activity; characterized by quickness of motion or action; lively; spirited; quick.

As a noun bustle is

an excited activity; a stir.

As nouns the difference between conventions and terminologies

is that conventions is while terminologies is .