swoop vs swoop up

swoop is a noun but swoop up is not a noun.

Word	Noun	Adjective	Verb	Adverb
swoop	Yes	No	Yes	No
swoop up	No	No	Yes	No

As verbs, swoop and swoop up are synonyms defined as:

swoop (noun)	swoop up (noun)
a swift descent through the air
a very rapid raid
(music) rapid sliding up or down the musical scale

swoop (verb)	swoop up (verb)
seize or catch with a swooping motion	seize or catch with a swooping motion
move down on as if in an attack
move with a sweep, or in a swooping arc