fast

As a verb fast

is .

As a noun go is

water.

As verbs the difference between penance and fast

is that penance is to impose penance; to punish while fast is .

As a noun penance

is a voluntary self-imposed punishment for a sinful act or wrongdoing it may be intended to serve as reparation for the act.

As an adverb promptly

is in prompt manner; both soon and quickly.

As a verb fast is

.

As an adjective incessant

is without pause or stop; not ending, especially to the point of annoyance.

As a verb fast is

.

As an adjective rampant

is (originally) rearing on both hind legs with the forelegs extended.

As a verb fast is

.

As nouns the difference between ships and fast

is that ships is plural of lang=en while fast is a train that calls at only some stations it passes between its origin and destination, typically just the principal stations.

As verbs the difference between ships and fast

is that ships is third-person singular of ship while fast is to abstain from food, or eat very little, especially for religious or medical reasons.

As an adjective fast is

firmly or securely fixed in place; stable.

As an adverb fast is

in a firm or secure manner, securely; in such a way as not to be moved .

As an interjection fast is

short for "stand fast", a warning not to pass between the arrow and the target.

As a noun rapidity

is speed, swiftness; the condition of being rapid.

As a verb fast is

.

As a verb fast

is .

As an adjective autistic is

pertaining to, or having autism.

As a noun autistic is

a person who has autism.

As an adverb fleetly

is in a fleet manner; swiftly.

As a verb fast is

.

In intransitive terms the difference between accelerate and fast

is that accelerate is grow; increase while fast is to abstain from food, or eat very little, especially for religious or medical reasons.

In obsolete terms the difference between accelerate and fast

is that accelerate is alternative form of lang=en while fast is tenacious; retentive.

In lang=en terms the difference between accelerate and fast

is that accelerate is accelerated; quickened; hastened; hurried while fast is firmly or securely fixed in place; stable.

As an adverb fast is

in a firm or secure manner, securely; in such a way as not to be moved .

As a noun fast is

a train that calls at only some stations it passes between its origin and destination, typically just the principal stations.

As an interjection fast is

short for "stand fast", a warning not to pass between the arrow and the target.