repulse vs rejection

repulse and rejection both are nouns.

Word	Noun	Adjective	Verb	Adverb
repulse	Yes	No	Yes	No
rejection	Yes	No	No	No

As nouns, rejection is a hypernym of repulse; that is, rejection is a word with a broader meaning than repulse:

repulse (noun)	rejection (noun)
an instance of driving away or warding off	the act of rejecting something
	the speech act of rejecting
	(medicine) an immunological response that refuses to accept substances or organisms that are recognized as foreign
	the state of being rejected

repulse (verb)	rejection (verb)
force or drive back
cause to move back by force or influence
be repellent to; cause aversion in