wall in vs wall

wall in is not a noun while wall is a noun.

Word	Noun	Adjective	Verb	Adverb
wall in	No	No	Yes	No
wall	Yes	No	Yes	No

wall in (noun)	wall (noun)
	an architectural partition with a height and length greater than its thickness; used to divide or enclose an area or to support another structure
	an embankment built around a space for defensive purposes
	a masonry fence (as around an estate or garden)
	a layer of material that encloses space
	(anatomy) a layer (a lining or membrane) that encloses a structure
	anything that suggests a wall in structure or function or effect
	a vertical (or almost vertical) smooth rock face (as of a cave or mountain)
	a difficult or awkward situation

wall in (verb)	wall (verb)
enclose with a wall	surround with a wall in order to fortify