Synonyms for seal

noun

• a member of a Naval Special Warfare unit who is trained for unconventional warfare
• fastener consisting of a resinous composition that is plastic when warm; used for sealing documents and parcels and letters
• a device incised to make an impression; used to secure a closing or to authenticate documents
• the pelt or fur (especially the underfur) of a seal
• an indication of approved or superior status
• a finishing coat applied to exclude moisture
• any of numerous marine mammals that come on shore to breed; chiefly of cold regions
• a stamp affixed to a document (as to attest to its authenticity or to seal it)
• fastener that provides a tight and perfect closure

verb

• make tight; secure against leakage
• cover with varnish
• affix a seal to
• close with or as if with a seal
• decide irrevocably
• hunt seals