walk-through vs walk through

walk-through is a noun but walk through is not a noun.

Word	Noun	Adjective	Verb	Adverb
walk-through	Yes	No	No	No
walk through	No	No	Yes	No

walk-through (noun)	walk through (noun)
a first perfunctory rehearsal of a theatrical production in which actors read their lines from the script and move as directed
the act of walking in order to view something
a pedestrian passageway through the ground floor of a building
a thorough explanation (usually accompanied by a demonstration) of each step in a procedure or process

walk-through (verb)	walk through (verb)
	perform in a perfunctory way, as for a first rehearsal