Yellow
Acacia.
Barberry
Witch Hazel
Cytisus or broom.
Japonica
Jasmine
In sub-tropical areas, allamanda cathartica is a soft shrub with clusters of bright yellow flowers at the tips of twigs. Not strongly fragrant, at least not in my garden.
Sounds like a Berberis.
a Jasmine is a climbing shrub with delicate and fragrant white or yellow flowers. fro9m Persia
The word is quassia.It's a small shrub with scarlet flowers and yellow-ish wood. The wood contains a chemical by the same name as the shrub used in insecticides.
A barberry is a thorny shrub of the genus Berberis, which bears yellow flowers and red or blue-black berries.