lingering vs delay

lingering and delay both are nouns.

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

As nouns, delay is a hypernym of lingering; that is, delay is a word with a broader meaning than lingering:

lingering: the act of tarrying
delay: the act of delaying; inactivity resulting in something being put off until a later time

Other hypernyms of lingering include holdup.

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

lingering (verb)	delay (verb)
	cause to be slowed down or delayed
	stop or halt
	slow the growth or development of
	act later than planned, scheduled, or required