Mere

A pool or lake.

A boundary.

To divide, limit, or bound.

A mare.

Unmixed; pure; entire; absolute; unqualified.

Only this, and nothing else; such, and no more; simple; bare; as, a mere boy; a mere form.

apart from anything else; without additions or modifications; "only the bare facts"; "shocked by the mere idea"; "the simple passage of time was enough"; "the simple truth"

a small pond of standing water