Seal
Part of speech: verb
Definition: To hunt seals To place a seal on (a document). To fasten (something) so that it cannot be opened without visible damage. To prevent people or vehicles from crossing (something). To close securely to prevent leakage. To place in a sealed container. To place a notation of one's next move in a sealed envelope to be opened after an adjournment. To guarantee To tie up animals (especially cattle) in their stalls.
Part of speech: noun
Definition: A pinniped, a large marine fish-eating mammal. A design associated with a government or governmental office. Something which will be visibly damaged if a covering or container is opened, and which may or may not bear an official design. (See the Wikipedia article) Something designed to prevent liquids or gases from leaking through a joint. Security against leakage. Security against unauthorized tampering.
Sill
Part of speech: noun
Definition: (also window sill) A horizontal slat which forms the base of a window.A horizontal member bearing the upright portion of a frame.A horizontal layer of igneous rock between older rock beds.