officially,or=あるいは(a lu i wa) but, in daily life we often say nouns first, then use the word"どち(do chi)", which means"which"

Japanese isn't that simple. You need to be far more specific. or = それとも But there are plenty of other ways to say it.

or=または（ma ta wa)、それとも、あるいは this one or that one ?＝これですか？　それとも　あれですか？ ⇒in this case， 'or' is unnessesary to transrate ,so　'this one or that one ?’＝ これですか？あれですか？

but how about "matawa" ?? can we use that ?