Italian cypress vs cypress tree

Italian cypress and cypress tree both are nouns.

Word	Noun	Adjective	Verb	Adverb
Italian cypress	Yes	No	No	No
cypress tree	Yes	No	No	No

As nouns, cypress tree is a hypernym of Italian cypress; that is, cypress tree is a word with a broader meaning than Italian cypress:

Italian cypress: tall Eurasian cypress with thin grey bark and ascending branches
cypress tree: any of numerous evergreen conifers of the genus Cupressus of north temperate regions having dark scalelike leaves and rounded cones

Other hypernyms of Italian cypress include cypress.

Italian cypress (noun)	cypress tree (noun)
tall Eurasian cypress with thin grey bark and ascending branches	any of numerous evergreen conifers of the genus Cupressus of north temperate regions having dark scalelike leaves and rounded cones