Courgette and Marrow squash

Courgette noun - Marrow squash plant whose fruit are eaten when small.

Marrow squash and courgette are semantically related. In some cases you can use "Marrow squash" instead a noun "Courgette".

Marrow squash noun - Any of various squash plants grown for their elongated fruit with smooth dark green skin and whitish flesh.

Courgette and marrow squash are semantically related. Sometimes you can replace term "Courgette" with "Marrow squash", this terms are similar.