deceit vs delusion

deceit and delusion both are nouns.

Word	Noun	Adjective	Verb	Adverb
deceit	Yes	No	No	No
delusion	Yes	No	No	No

As nouns, delusion is a hyponym of deceit; that is, delusion is a word with a more specific, narrower meaning than deceit:

deceit (noun)	delusion (noun)
the act of deceiving	the act of deluding; deception by creating illusory ideas
the quality of being fraudulent	a mistaken or unfounded opinion or idea
a misleading falsehood	(psychology) an erroneous belief that is held in the face of evidence to the contrary