crushing vs stifling

crushing and stifling both are nouns.

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

As nouns, crushing and stifling are synonyms defined as:

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

Other synonyms of crushing include quelling, suppression.

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

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