jack oak vs northern pin oak

jack oak and northern pin oak both are nouns.

Word	Noun	Adjective	Verb	Adverb
jack oak	Yes	No	No	No
northern pin oak	Yes	No	No	No

As nouns, jack oak and northern pin oak are synonyms defined as:

jack oak and northern pin oak: small to medium deciduous oak of east central North America; leaves have sharply pointed lobes

Other synonyms of jack oak include Quercus ellipsoidalis.

jack oak (noun)	northern pin oak (noun)
small to medium deciduous oak of east central North America; leaves have sharply pointed lobes	small to medium deciduous oak of east central North America; leaves have sharply pointed lobes
a common scrubby deciduous tree of central and southeastern United States having dark bark and broad three-lobed (club-shaped) leaves; tends to form dense thickets