duck vs duck down

duck and duck down both are nouns.

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

duck (noun)	duck down (noun)
small wild or domesticated web-footed broad-billed swimming bird usually having a depressed body and short legs	down of the duck
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 (verb)	duck down (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