lour vs turn down

lour and turn down both are verbs.

Word	Noun	Adjective	Verb	Adverb
lour	No	No	Yes	No
turn down	No	No	Yes	No

As verbs, lour and turn down are synonyms defined as:

Other synonyms of lour include lower.

lour (verb)	turn down (verb)
look angry or sullen, wrinkle one's forehead, as if to signal disapproval	make lower or quieter
make lower or quieter	take a downward direction
set lower	reject with contempt
	not accept as true
	refuse entrance or membership