Nouns

(n)sealing wax, sealfastener consisting of a resinous composition that is plastic when warm; used for sealing documents and parcels and letters
(n)seal, stampa device incised to make an impression; used to secure a closing or to authenticate documents
(n)seal, sealskinthe pelt or fur (especially the underfur) of a seal“a coat of seal”
(n)seala stamp affixed to a document (as to attest to its authenticity or to seal it)“the warrant bore the sheriff's seal”
(n)cachet, seal, seal of approvalan indication of approved or superior status
(n)seala finishing coat applied to exclude moisture
(n)sealfastener that provides a tight and perfect closure
(n)sealany of numerous marine mammals that come on shore to breed; chiefly of cold regions

Verbs

(v)seal, seal offmake tight; secure against leakage“seal the windows”
(v)sealclose with or as if with a seal“She sealed the letter with hot wax”
(v)sealdecide irrevocably“sealing dooms”
(v)sealaffix a seal to“seal the letter”
(v)varnish, sealcover with varnish
(v)sealhunt seals