I hate these s/z words! I learned many as a young child-- reading books sent to me from Ireland-- and learned the UK spelling-- which most US word processors reject-- and then there is raze (rase)-- the opposite in some ways of raise-- (to tear down-- to raze a building-) While i would most often "erect" or build a building-- in NY you "raise steel" and a building rises up-- (skyscapers are raised-- small house are not)

(and to make matters worse-- my favorite everyday dictionary-- (not my work one, which is M-W 10th) is Chambers.-- ex got the OED in divorce)

the different spellings are shade of grey!