retard vs delay

retard and delay both are nouns.

Word	Noun	Adjective	Verb	Adverb
retard	Yes	No	Yes	No
delay	Yes	No	Yes	No

As verbs, delay is a hyponym of retard; that is, delay is a word with a more specific, narrower meaning than retard:

Other hyponyms of retard include slow, slow down, slow up, detain, hold up.

As verbs, retard and delay are synonyms defined as:

Other synonyms of retard include check.

As verbs, delay is a hyponym of retard; that is, delay is a word with a more specific, narrower meaning than retard:

Other hyponyms of retard include dampen, detain, stay.

retard (noun)	delay (noun)
a person of subnormal intelligence	the act of delaying; inactivity resulting in something being put off until a later time
	time during which some action is awaited

retard (verb)	delay (verb)
lose velocity; move more slowly	cause to be slowed down or delayed
cause to move more slowly or operate at a slower rate	stop or halt
slow the growth or development of	slow the growth or development of
be delayed	act later than planned, scheduled, or required