We don't have synonyms for rowanberry yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are loganberry, rowan berry and rosenberry.
(n) :
The small spherical fruits of the rowan or European rowan (Sorbus aucuparia), a species of rowan (Sorbus subg. Sorbus), native to most of Europe except for the far south, and northern Asia; the fruits are bitter and inedible if uncooked, but may be used in the making of jellies and jams.
(n) :
The small spherical fruits of the rowan or European rowan (Sorbus aucuparia), a species of rowan (Sorbus subg. Sorbus), native to most of Europe except for the far south, and northern Asia; the fruits are bitter and inedible if uncooked, but may be used in the making of jellies and jams.