turn down vs dishonour

turn down is not a noun while dishonour is a noun.

Word	Noun	Adjective	Verb	Adverb
turn down	No	No	Yes	No
dishonour	Yes	No	Yes	No

As verbs, dishonour is a hyponym of turn down; that is, dishonour is a word with a more specific, narrower meaning than turn down:

Other hyponyms of turn down include dishonor, bounce.

turn down (noun)	dishonour (noun)
	lacking honor or integrity
	a state of shame or disgrace

turn down (verb)	dishonour (verb)
make lower or quieter	refuse to accept
take a downward direction	bring shame or dishonor upon
reject with contempt	force (someone) to have sex against their will
not accept as true
refuse entrance or membership