vegetable marrow vs marrow squash

vegetable marrow and marrow squash both are nouns.

Word	Noun	Adjective	Verb	Adverb
vegetable marrow	Yes	No	No	No
marrow squash	Yes	No	No	No

As nouns, vegetable marrow and marrow squash are synonyms defined as:

vegetable marrow and marrow squash: any of various squash plants grown for their elongated fruit with smooth dark green skin and whitish flesh

Other synonyms of vegetable marrow include marrow.

vegetable marrow (noun)	marrow squash (noun)
large elongated squash with creamy to deep green skins	any of various squash plants grown for their elongated fruit with smooth dark green skin and whitish flesh
any of various squash plants grown for their elongated fruit with smooth dark green skin and whitish flesh