* Ark (noun) - A large, flat-bottomed boat, especially one used by Noah in the biblical story of the Flood.
* Arkansas (noun) - A state in the southern United States.
* Arkose (noun) - A sandstone containing a high percentage of feldspar grains.
* Arkwright (noun) - A British inventor who developed the spinning jenny.
* Arkive (noun) - A website and database of wildlife conservation information and multimedia.
* Arkon (noun) - A fictional planet in the "Perry Rhodan" science fiction series.
Let me know if you'd like more words starting with "ark"!