As nouns the difference between seal and phocine
is that seal
is a pinniped (pinnipedia), particularly an earless seal (true seal) or eared seal or seal
can be a stamp used to impress a design on a soft substance such as wax while phocine
is (zoology) a member of the subfamily phocinae, comprising the "true" or "earless" seals.
As a verb seal
is to hunt seals or seal
can be to place a seal on (a document) or seal
can be (dialectal) to tie up animals (especially cattle) in their stalls.
As a adjective phocine is
pertaining to a seal (or other members of the subfamily phocinae; seallike.