linger vs mill about

linger and mill about both are verbs.

Word	Noun	Adjective	Verb	Adverb
linger	No	No	Yes	No
mill about	No	No	Yes	No

As verbs, linger and mill about are synonyms defined as:

Other synonyms of linger include footle, hang around, lallygag, loaf, loiter, lollygag, lounge, lurk, mess about, mill around, tarry.

linger (verb)	mill about (verb)
take one's time; proceed slowly	move about in a confused manner
leave slowly and hesitantly	be about a place without any apparent purpose
be about a place without any apparent purpose
to hang about in a place beyond the proper or usual time
remain present although waning or gradually dying