English oak vs common oak

English oak and common oak both are nouns.

Word	Noun	Adjective	Verb	Adverb
English oak	Yes	No	No	No
common oak	Yes	No	No	No

As nouns, English oak and common oak are synonyms defined as:

English oak and common oak: medium to large deciduous European oak having smooth leaves with rounded lobes; yields hard strong light-colored wood

Other synonyms of English oak include pedunculate oak, Quercus robur.

English oak (noun)	common oak (noun)
medium to large deciduous European oak having smooth leaves with rounded lobes; yields hard strong light-colored wood	medium to large deciduous European oak having smooth leaves with rounded lobes; yields hard strong light-colored wood