Webster's Revised Unabridged Dictionary · 1913

Hooper

Hooper , noun

[See 1st Hoop.]

One who hoops casks or tubs; a cooper.

Hooper , noun

[So called from its note.]

(Zoology) The European whistling, or wild, swan (Olor cygnus); -- called also hooper swan, whooping swan, and elk.