fastness vs fast

fast vs fastness

fastness and fast both are nouns.

fastness is not an adjective while fast is an adjective.

fastness is not a verb while fast is a verb.

fastness is not an adverb while fast is an adverb.

Word	Noun	Adjective	Verb	Adverb
fastness	Yes	No	No	No
fast	Yes	Yes	Yes	Yes

fastness (noun)	fast (noun)
a strongly fortified defensive structure	abstaining from food
a rate (usually rapid) at which something happens
the quality of being fixed in place as by some firm attachment

fastness (adjective)	fast (adjective)
	acting or moving or capable of acting or moving quickly
	at a rapid tempo
	(used of timepieces) indicating a time ahead of or later than the correct time
	(of a photographic lens or emulsion) causing a shortening of exposure time
	unwavering in devotion to friend or vow or cause
	securely fixed in place
	hurried and brief
	unrestrained by convention or morality
	resistant to destruction or fading
	(of surfaces) conducive to rapid speeds

fastness (verb)	fast (verb)
	abstain from eating
	abstain from certain foods, as for religious or medical reasons

fastness (adverb)	fast (adverb)
	quickly or rapidly (often used as a combining form)
	firmly or closely

Difference between fastness and fast

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