deterrent vs impediment

deterrent and impediment both are nouns.

Word	Noun	Adjective	Verb	Adverb
deterrent	Yes	Yes	No	No
impediment	Yes	No	No	No

As nouns, deterrent and impediment are synonyms defined as:

deterrent and impediment: something immaterial that interferes with or delays action or progress

Other synonyms of deterrent include balk, baulk, check, handicap, hinderance, hindrance.

deterrent (noun)	impediment (noun)
something immaterial that interferes with or delays action or progress	any structure that makes progress difficult
	something immaterial that interferes with or delays action or progress

deterrent (adjective)	impediment (adjective)
tending to deter