sit vs brood

sit is not a noun while brood is a noun.

Word	Noun	Adjective	Verb	Adverb
sit	No	No	Yes	No
brood	Yes	No	Yes	No

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

sit (verb)	brood (verb)
serve in a specific professional capacity	sit on (eggs)
be in a position in which one's upper body is largely upright and supported by one's backside	think moodily or anxiously about something
show to a seat; assign a seat for	be in a huff; be silent or sullen
take a seat	be in a huff and display one's displeasure
be in session	hang over, as of something threatening, dark, or menacing
sit and travel on the back of animal, usually while controlling its motions
assume a posture as for artistic purposes
work or act as a baby-sitter
be around, often idly or without specific purpose
be located or situated somewhere