hot vs red-hot

hot and red-hot both are adjectives.

Word	Noun	Adjective	Verb	Adverb
hot	No	Yes	No	No
red-hot	No	Yes	No	No

As adjectives, hot and red-hot are synonyms defined as:

Other synonyms of hot include blistering.

As adjectives, hot and red-hot are synonyms defined as:

hot (adjective)	red-hot (adjective)
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	very fast; capable of quick response and great speed
(extended meanings, especially of psychological heat) marked by intensity or vehemence especially of passion or enthusiasm	glowing red with heat
marked by excited activity	newest or most recent
charged or energized with electricity	having strong sexual appeal
having or showing great eagerness or enthusiasm	characterized by intense emotion or interest or excitement
very fast; capable of quick response and great speed
made recently
very good; often used in the negative
recently stolen or smuggled
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