stifling vs crushing

stifling and crushing both are nouns.

Word	Noun	Adjective	Verb	Adverb
stifling	Yes	Yes	No	No
crushing	Yes	Yes	No	No

As nouns, stifling and crushing are synonyms defined as:

stifling and crushing: forceful prevention; putting down by power or authority

Other synonyms of stifling include quelling, suppression.

stifling (noun)	crushing (noun)
forceful prevention; putting down by power or authority	forceful prevention; putting down by power or authority

stifling (adjective)	crushing (adjective)
characterized by oppressive heat and humidity	physically or spiritually devastating; often used in combination