Pinus rigida vs northern pitch pine

Pinus rigida and northern pitch pine both are nouns.

Word	Noun	Adjective	Verb	Adverb
Pinus rigida	Yes	No	No	No
northern pitch pine	Yes	No	No	No

As nouns, Pinus rigida and northern pitch pine are synonyms defined as:

Pinus rigida and northern pitch pine: large three-needled pine of the eastern United States and southeastern Canada; closely related to the pond pine

Other synonyms of Pinus rigida include pitch pine.

Pinus rigida (noun)	northern pitch pine (noun)
large three-needled pine of the eastern United States and southeastern Canada; closely related to the pond pine	large three-needled pine of the eastern United States and southeastern Canada; closely related to the pond pine