sit down vs hatch

sit down is not a noun while hatch is a noun.

Word	Noun	Adjective	Verb	Adverb
sit down	No	No	Yes	No
hatch	Yes	No	Yes	No

sit down (noun)	hatch (noun)
	a movable barrier covering a hatchway
	a sloping rear car door that is lifted to open
	shading consisting of multiple crossing lines
	the production of young from an egg

sit down (verb)	hatch (verb)
show to a seat; assign a seat for	sit on (eggs)
be in a position in which one's upper body is largely upright and supported by one's backside	emerge from the eggs
take a seat	draw, cut, or engrave lines, usually parallel, on metal, wood, or paper
	devise or invent
	inlay with narrow strips or lines of a different substance such as gold or silver, for the purpose of decorating