Puffin and Sea bird

Puffin noun - Any of two genera of northern seabirds having short necks and brightly colored compressed bills.

Sea bird and puffin are semantically related. In some cases you can use "Sea bird" instead a noun "Puffin".

Sea bird noun - A bird that frequents coastal waters and the open ocean: gulls; pelicans; gannets; cormorants; albatrosses; petrels; etc..

Puffin and sea bird are semantically related. Sometimes you can replace term "Puffin" with "Sea bird", this terms are similar.