duck down vs duck

duck down and duck both are nouns.

Word	Noun	Adjective	Verb	Adverb
duck down	Yes	No	No	No
duck	Yes	No	Yes	No

duck down (noun)	duck (noun)
down of the duck	small wild or domesticated web-footed broad-billed swimming bird usually having a depressed body and short legs
	a heavy cotton fabric of plain weave; used for clothing and tents
	flesh of a duck (domestic or wild)
	(cricket) a score of nothing by a batsman

duck down (verb)	duck (verb)
	avoid or try to avoid fulfilling, answering, or performing (duties, questions, or issues)
	to move (the head or body) quickly downwards or away
	submerge or plunge suddenly
	dip into a liquid