pin oak vs oak

pin oak and oak both are nouns.

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

As nouns, oak is a hypernym of pin oak; that is, oak is a word with a broader meaning than pin oak:

pin oak: fast-growing medium to large pyramidal deciduous tree of northeastern United States and southeastern Canada having deeply pinnatifid leaves that turn bright red in autumn; thrives in damp soil
oak: a deciduous tree of the genus Quercus; has acorns and lobed leaves

Other hypernyms of pin oak include oak tree.

As nouns, oak is a hypernym of pin oak; that is, oak is a word with a broader meaning than pin oak:

pin oak: large nearly semi-evergreen oak of southeastern United States; thrives in damp soil
oak: a deciduous tree of the genus Quercus; has acorns and lobed leaves

Other hypernyms of pin oak include oak tree.

pin oak (noun)	oak (noun)
fast-growing medium to large pyramidal deciduous tree of northeastern United States and southeastern Canada having deeply pinnatifid leaves that turn bright red in autumn; thrives in damp soil	a deciduous tree of the genus Quercus; has acorns and lobed leaves
large nearly semi-evergreen oak of southeastern United States; thrives in damp soil	the hard durable wood of any oak; used especially for furniture and flooring