Here is a list of nouns that start with SEA.
sea, seacoast, seafood, seahorse, seal
sealing, seam, seaman, seamanship, seamen
seaquake, search, searching, searchlight, seashore
seaside, season, seasoning, seat, seato
seaweed
Hope you enjoy this page of nouns that start with sea and the rest of this noun list a-z site as well.
Help make this a better resource by adding more nouns in the comments section. Thanks.