Grebe and Podicipitiform seabird

Grebe noun - Small compact-bodied almost completely aquatic bird that builds floating nests; similar to loons but smaller and with lobate rather than webbed feet.

Podicipitiform seabird and grebe are semantically related. In some cases you can use "Podicipitiform seabird" instead a noun "Grebe".

Podicipitiform seabird noun - Aquatic birds related to the loons.

Grebe and podicipitiform seabird are semantically related. Sometimes you can replace term "Grebe" with "Podicipitiform seabird", this terms are similar.