straggler vs dawdler

straggler and dawdler both are nouns.

Word	Noun	Adjective	Verb	Adverb
straggler	Yes	No	No	No
dawdler	Yes	No	No	No

As nouns, dawdler is a hypernym of straggler; that is, dawdler is a word with a broader meaning than straggler:

straggler: someone who strays or falls behind
dawdler: someone who takes more time than necessary; someone who lags behind

Other hypernyms of straggler include drone, laggard, lagger, poke, trailer.

straggler (noun)	dawdler (noun)
someone who strays or falls behind	someone who takes more time than necessary; someone who lags behind