The Hebrew noun tevah (תֵּבָה) refers to a large vessel or chest. It appears only twice in the OT: for Noah's ark (Genesis 6–9) and for the basket in which the infant Moses was placed (Exodus 2:3). This is distinct from the Ark of the Covenant (aron).
The two uses of tevah create a remarkable typological pair. Both arks carried the seed of salvation through waters of judgment. Noah's tevah preserved eight souls through the flood — 'a few people, eight in all, were saved through water' (1 Peter 3:20). Moses' tevah, daubed with pitch (the same Hebrew word as 'atonement' — kaphar!), floated on the Nile to preserve the deliverer of Israel. Both arks point to Christ: He is the true Ark of salvation, who passed through the waters of judgment (the cross/death) and carries all who are 'in Him' safely to the other shore. Baptism echoes this: the waters that judge also save those united to Christ (1 Peter 3:21).