waver vs linger

waver is a noun but linger is not a noun.

Word	Noun	Adjective	Verb	Adverb
waver	Yes	No	Yes	No
linger	No	No	Yes	No

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

Other hyponyms of waver include dwell on, linger over, boggle, hover, hover, oscillate, vacillate, vibrate, falter, waver.

waver (noun)	linger (noun)
the act of moving back and forth
the act of pausing uncertainly
someone who communicates by waving

waver (verb)	linger (verb)
give off unsteady sounds, alternating in amplitude or frequency	take one's time; proceed slowly
sway from side to side	leave slowly and hesitantly
move or sway in a rising and falling or wavelike pattern	be about a place without any apparent purpose
move back and forth very rapidly	to hang about in a place beyond the proper or usual time
move hesitatingly, as if about to give way	remain present although waning or gradually dying
pause or hold back in uncertainty or unwillingness
be unsure or weak