retard vs hold up

retard is a noun but hold up is not a noun.

Word	Noun	Adjective	Verb	Adverb
retard	Yes	No	Yes	No
hold up	No	No	Yes	No

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

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

retard (noun)	hold up (noun)
a person of subnormal intelligence

retard (verb)	hold up (verb)
lose velocity; move more slowly	cause to be slowed down or delayed
cause to move more slowly or operate at a slower rate	be the physical support of; carry the weight of
slow the growth or development of	hold up something as an example; hold up one's achievements for admiration
be delayed	rob at gunpoint or by means of some other threat
	continue to live and avoid dying
	resist or withstand wear, criticism, etc.
	resist or confront with resistance