laggard vs idler

laggard and idler both are nouns.

Word	Noun	Adjective	Verb	Adverb
laggard	Yes	Yes	No	No
idler	Yes	No	No	No

As nouns, idler is a hypernym of laggard; that is, idler is a word with a broader meaning than laggard:

laggard: someone who takes more time than necessary; someone who lags behind
idler: person who does no work

Other hypernyms of laggard include bum, do-nothing, layabout, loafer.

laggard (noun)	idler (noun)
someone who takes more time than necessary; someone who lags behind	person who does no work

laggard (adjective)	idler (adjective)
wasting time