Frigate bird and Frigate-bird

Frigate bird noun - Long-billed warm-water seabird with wide wingspan and forked tail.

Frigate-bird and frigate bird are semantically related. In some cases you can use "Frigate-bird" instead a noun phrase "Frigate bird".

Frigate bird and frigate-bird are semantically related. Sometimes you can replace phrase "Frigate bird" with "Frigate-bird", this phrases are similar.