Moa and Ratite

Moa noun - Extinct flightless bird of New Zealand.

Ratite and moa are semantically related. In some cases you can use "Ratite" instead a noun "Moa".

Ratite noun - Flightless birds having flat breastbones lacking a keel for attachment of flight muscles: ostriches; cassowaries; emus; moas; rheas; kiwis; elephant birds.

Moa and ratite are semantically related. Sometimes you can replace term "Moa" with "Ratite", this nouns are similar.