floodlight vs light up

floodlight is a noun but light up is not a noun.

Word	Noun	Adjective	Verb	Adverb
floodlight	Yes	No	Yes	No
light up	No	No	Yes	No

As verbs, light up is a hypernym of floodlight; that is, light up is a word with a broader meaning than floodlight:

Other hypernyms of floodlight include illume, illuminate, illumine, light.

floodlight (noun)	light up (noun)
light that is a source of artificial illumination having a broad beam; used in photography

floodlight (verb)	light up (verb)
illuminate with floodlights	introduce light into
	begin to smoke
	become clear
	start to burn with a bright flame
	ignite