pick vs pick off

pick is a noun but pick off is not a noun.

Word	Noun	Adjective	Verb	Adverb
pick	Yes	No	Yes	No
pick off	No	No	Yes	No

pick (noun)	pick off (noun)
the act of choosing or selecting
a basketball maneuver; obstructing an opponent with one's body
a heavy iron tool with a wooden handle and a curved head that is pointed on both ends
a thin sharp implement used for removing unwanted material
the yarn woven across the warp yarn in weaving
a small thin device (of metal or plastic or ivory) used to pluck a stringed instrument
the person or thing chosen or selected
the best people or things in a group
the quantity of a crop that is harvested

pick (verb)	pick off (verb)
remove in small bits	pull or pull out sharply
remove unwanted substances from, such as feathers or pits	shoot one by one
select carefully from a group
harass with constant criticism
eat intermittently; take small bites of
hit lightly with a picking motion
look for and gather
attack with or as if with a pickaxe of ice or rocky ground, for example
pull lightly but sharply with a plucking motion
provoke
pay for something
pilfer or rob