bulk large vs brood

bulk large is not a noun while brood is a noun.

Word	Noun	Adjective	Verb	Adverb
bulk large	No	No	Yes	No
brood	Yes	No	Yes	No

As verbs, bulk large and brood are synonyms defined as:

bulk large and brood: hang over, as of something threatening, dark, or menacing

Other synonyms of bulk large include hover, loom.

bulk large (noun)	brood (noun)
	the young of an animal cared for at one time

bulk large (verb)	brood (verb)
hang over, as of something threatening, dark, or menacing	sit on (eggs)
	think moodily or anxiously about something
	be in a huff; be silent or sullen
	be in a huff and display one's displeasure
	hang over, as of something threatening, dark, or menacing