The Hebrew word commonly translated “Ark” for Noah’s vessel in Genesis is tebah.
The term appears in the Hebrew flood narrative and is usually transliterated as tebah or tevah. It is also used for the basket in which the infant Moses is placed in the Book of Exodus, creating a linguistic connection between two stories of rescue from dangerous waters.
Tebah is not the same Hebrew word as the term for the Ark of the Covenant, which is commonly called aron. This distinction is easy to miss in English because both objects are translated with the word “ark,” even though they are different objects with different Hebrew names and narrative functions.
The word’s exact broader etymology is debated, but its biblical usage is clear enough for this question. In Genesis, tebah refers to Noah’s large vessel, while in Exodus it refers to Moses’ protective basket.