common osier vs velvet osier

common osier and velvet osier both are nouns.

Word	Noun	Adjective	Verb	Adverb
common osier	Yes	No	No	No
velvet osier	Yes	No	No	No

As nouns, common osier and velvet osier are synonyms defined as:

common osier and velvet osier: willow with long flexible twigs used in basketry

Other synonyms of common osier include hemp willow, Salix viminalis.

common osier (noun)	velvet osier (noun)
willow with long flexible twigs used in basketry	willow with long flexible twigs used in basketry