oak vs fumed oak

oak and fumed oak both are nouns.

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

As nouns, fumed oak is a hyponym of oak; that is, fumed oak is a word with a more specific, narrower meaning than oak:

oak: the hard durable wood of any oak; used especially for furniture and flooring
fumed oak: oak given a weathered appearance by exposure to fumes of ammonia; used for cabinetwork

Other hyponyms of oak include holm oak.

oak (noun)	fumed oak (noun)
a deciduous tree of the genus Quercus; has acorns and lobed leaves	oak given a weathered appearance by exposure to fumes of ammonia; used for cabinetwork
the hard durable wood of any oak; used especially for furniture and flooring