fast vs fastness

fastness vs fast

fast and fastness both are nouns.

fast is an adjective but fastness is not an adjective.

fast is a verb but fastness is not a verb.

fast is an adverb but fastness is not an adverb.

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

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

fast (adjective)	fastness (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

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

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

Difference between fast and fastness

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