Pelican and Pelecaniform seabird

Pelican noun - Large long-winged warm-water seabird having a large bill with a distensible pouch for fish.

Pelecaniform seabird and pelican are semantically related. In some cases you can use "Pelecaniform seabird" instead a noun "Pelican".

Pelecaniform seabird noun - Large fish-eating seabird with four-toed webbed feet.

Pelican and pelecaniform seabird are semantically related. Sometimes you can replace term "Pelican" with "Pelecaniform seabird", this terms are similar.