hemlock tree vs conifer

hemlock tree and conifer both are nouns.

Word	Noun	Adjective	Verb	Adverb
hemlock tree	Yes	No	No	No
conifer	Yes	No	No	No

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

hemlock tree: an evergreen tree, could refer to any one of a genus of conifers named Tsuga
conifer: any gymnospermous tree or shrub bearing cones

Other hypernyms of hemlock tree include coniferous tree.

hemlock tree (noun)	conifer (noun)
an evergreen tree, could refer to any one of a genus of conifers named Tsuga	any gymnospermous tree or shrub bearing cones