fast vs hot

fast is a noun but hot is not a noun.

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

fast (noun)	hot (noun)
abstaining from food

fast (adjective)	hot (adjective)
acting or moving or capable of acting or moving quickly	used of physical heat; having a high or higher than desirable temperature or giving off heat or feeling or causing a sensation of heat or burning
at a rapid tempo	(extended meanings, especially of psychological heat) marked by intensity or vehemence especially of passion or enthusiasm
(used of timepieces) indicating a time ahead of or later than the correct time	marked by excited activity
(of a photographic lens or emulsion) causing a shortening of exposure time	charged or energized with electricity
unwavering in devotion to friend or vow or cause	having or showing great eagerness or enthusiasm
securely fixed in place	very fast; capable of quick response and great speed
hurried and brief	made recently
unrestrained by convention or morality	very good; often used in the negative
resistant to destruction or fading	recently stolen or smuggled
(of surfaces) conducive to rapid speeds	having or bringing unusually good luck
	of a seeker; very near to the object sought
	newest or most recent
	very popular or successful
	having or dealing with dangerously high levels of radioactivity
	sexually excited or exciting
	performed or performing with unusually great skill and daring and energy
	producing a burning sensation on the taste nerves
	very unpleasant or even dangerous
	characterized by violent and forceful activity or movement; very intense
	wanted by the police
	(color) bold and intense

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

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