"We did not eat rice."
Translation:Nós não comemos arroz.
Yes. For such verb (and a few others) the past on the 1st plural form is conjugated the same way. We will notice the difference by the context. Nós comemos = we eat, ate / nós pagamos = we pay, paid / nós corremos = we run, ran / nós pensamos = we think, thought, and so on....